Microsoft has however laid out the most important consumer-facing features, which is somewhat more digestible.
See the list after the break.
- Third column of tiles on devices of all screen sizes. Ability to customize your Start backgroundwith a favorite picture or make many of the tiles on your Start screen become clear so you can see the background you selected as you scroll up and down.
- A new Lock screen app that lets you set a wide range of interesting “Lock Screen Themes” which show all kinds of different visuals and animations
- Cortana, the personal-assistant can be accessed by either a Live Tile on your Start screen or by pressing the search button on your device. This will take you to Cortana Home. To interact with Cortana, you can either speak or type—if you’re in a meeting, just type and Cortana won’t talk out loud. But if you ask her a spoken question, she’ll answer verbally and even carry on a natural conversation.
- When you interact with Cortana for the VERY first time, she will start learning things about you… like your name, how to pronounce it, and ask for some personal interests. Once she’s learned a bit about you, Cortana’s home populates with information that is curated just for you. You’ll see things like flight information she’s found from your email confirmations, weather, the latest news, and even traffic information once she learns your commute routine, such as from work and home. So all the stuff Cortana curates for you is stored in Cortana’s Notebook.
- Cortana is powered by Bing, some of the interests in Cortana’s Notebook will light up onBing.com when you sign in on the web. Bing.com will give you access to the things Cortana tracks for you, like your weather, stocks, news, and flights.
- Cortana will be able to interact with 3rd Party Apps installed on your phone. You can ask Cortana to help you make a video call in Skype, watch a TV show in Hulu Plus, look up a news feed on Facebook or send a tweet using the Twitter app
- Action Center to enable you to see notifications from any app – pinned or not—and to give you a customizable way to quickly access the settings you care about most, like Wi-Fi, Flight Mode, Bluetooth and Rotation Lock.
- Word Flow Keyboard: The keyboard in Windows Phone is smart enough to learn your writing style and even knows the names of people in your contacts for faster typing. Best of all, our new Word Flow Keyboard lets you glide your fingers over the keys to type INCREDIBLY quickly… a kid was able to BREAK THE OFFICIAL WORLD RECORD previously held by the Swype keyboard on a Samsung Galaxy S4 using Word Flow by 8 seconds!
- The new Skype app for Windows Phone 8.1 brings the best of Skype on a smartphone. It’s integrated with the Phone dialer, so if you’re on a call you can quickly and easily “upgrade” your ordinary phone call to a Skype video call at the tap of a button! And… the new Skype app is designed to work seamlessly with Cortana so you can use Cortana to setup your calls within Skype.
- The new Calendar has been redesigned to add a new week view which lots of people have been asking for and it has many nice touches—like panning right to get to the next day or week or month! What’s more, it looks a lot like Outlook on your Windows PC… e.g., the weather is integrated at the top – just like in Outlook.
- In Music app, you can edit your playlists and manage your cloud collection really easily and effectively. Video makes it possible to buy or rent videos from Xbox Music, and Podcasts now lets you subscribe to any RSS feed AND provides a Bing-powered podcast search for every country where Windows Phone is available. Improved phone volume control by including separate sliders for your ringer/notifications and for your apps and media.
- The People Hub has higher-fidelity feeds for your social network content (large photos!) and it connects directly to 3rd-party social networking apps so that you can have easy access to all the full functionality of the 3rd party apps once they are installed. Email now supports S/MIME secure email, and we’ve broadened our support for different account types, now including iCloud.
- Photos Gallery: Now jump directly to your most recent photos and shows as collections automatically organized, in a view grouped by date and location. Online photo albums are now supported via app-extensibility, so 3rd parties can plug in their services. In the Camera, we’ve updated the UI and added “burst mode” photography that lets you capture exactly the perfect moment—just like on Windows 8.1.
- Data Sense lets you track how much data usage you use in a given month and will give you a breakdown of usage by app so you can see which app is using the most of your data. As you near your data limit, Data Sense will more aggressively offload data to Wi-Fi and limit cellular usage… and in 8.1 there’s a new “high savings” mode that cranks up the compression of images as you browse the web so you can browse even farther using less data than WP8.
- Wi-Fi Sense will automatically connect you to free public hotspots it finds to help you save cellular data. And, if you’d like, you can opt-in to automatically and securely enable your friends and contacts to auto-connect to your home Wi-Fi, so they can use the internet connection at your house without hassling you for the password and typing it in manually. If you turn off Wi-Fi in Wi-Fi Sense, you can have Cortana automatically turn it back on when you reach one of your favorite places as identified in Cortana.
- Storage Sense helps you get the most out of the memory and storage on your phone. It will help you manage content you have on an SD memory card if your device supports those. You can also move content – like apps, music, photos – between the storage built in to your device and an SD memory card.
- Battery Saver gives you a clear breakdown of how apps are using your battery so you can make more informed usage decisions. With “automatic mode” enabled, it can dramatically extend your battery life.
- Windows and Windows Phone 8.1 integration: Your Microsoft Account allows Windows and Windows Phone to work together in amazing ways. Windows Phone 8.1 furthers the integration between phone and PC. If you change your theme color, that change will sync across all your Windows devices. If you buy an in-app purchase in some of the newer apps written forWindows Phone and Windows 8.1, the purchase works on your phone AND your PC. And other settings like your home Wi-Fi password will also sync.
- Project your phone screen onto a PC, TV set or projector? We’ve added support for that as well—connect your Windows Phone to a compatible PC using a USB cable and you can run an application on the PC to show the phone screen. Some of the forthcoming new phones will also support wireless Miracast display to compatible TVs and other devices.
- Internet Explorer 11 for Windows Phone, you will be able to see all the open tabs you have on all your Windows devices and all your Favorites too. Plus the new Internet Explorer gives you InPrivate browsing, password caching, and a super-handy reading mode.
- With Windows Phone 8.1, it is even easier for IT professionals to manage devices and for professionals to connect to essential business apps and services with features such as customizable MDM enrollment, support for loads more MDM policies, LOB application & certificate management, S/MIME and VPN support.
Source: Windows Team Blog