We’ve had Windows Phone Apollo and Windows Phone Blue, and now we know for sure the next version of Windows Phone will be code-named Windows Phone Threshold.
The code-name is a Halo-derived code name, and was the the planet around which the first halo ring orbited in the original Halo game.
Threshold is expected to unify the app store of Windows Phone, Windows 8 and Xbox and also the development toolsets for each platform, as revealed in an internal email by Microsoft Executive Vice President Terry Myerson.
Threshold will also bring the same core set of “high value activities” across platforms. These high-value activities include expression/documents (Office, and the coming “Remix” digital storytelling app); decision making/task completion (likely Bing); IT management (such as Intune and Workplace Join) and “serious fun.”
The updates is expected be released in Spring 2015, around April, and before this Microsoft is expected to release an update for Windows 8.1 called Windows 8.1 Update 1 and also Windows Phone 8.1 around Spring (Q2) 2014.