Microsoft has been talking about new features in Windows 8.1 at TechEd New Orleans 2013. Some new features include
NFC tap-to-pair printing – Tap your Windows 8.1 device against an enterprise NFC-enabled printer and you’re all set to print. No more hunting on your network for the correct printer and no need to buy a special printer; just attach a NFC tag to your existing machines. And you don’t need to buy new printers to take advantage of this; you can simply put an NFC tag on your existing printers to enable this functionality.
Wi-Fi Direct printing – Connect to Wi-Fi Direct printers without adding additional drivers or software on your Windows 8.1 device, forming a peer-to-peer network between your device and the printer.
Broadband tethering – Turn your Windows 8.1 mobile broadband-enabled PC or tablet into a personal Wi-Fi hotspot, allowing other devices to connect and access the internet.
Source: Windows Blog