According to a January 11 report from Windows SuperSite's Paul Thurrott, Microsoft Threshold looks to be a spring 2015 release wave. Specifically, if Microsoft sticks to schedule, Threshold should crest around April 2015, Thurrott said he's been told by his own sources.
Microsoft is going to disclose its Threshold plans at a "vision" level at its Build conference in San Francisco in April 2014, Thurrott said. If this happens, it'll be a back to the future moment -- and one that will be welcomed by many in Microsoft's developer and user communities. Microsoft's Windows division finally will begin sharing at least some details about its future Windows plans publicly again.
Threshold will include updates to all three Windows OS platforms (Xbox One, Windows and Windows Phone) that will advance them in a way to share even more common elements, my sources have said. It's not clear from Thurrott's report how much Microsoft execs will say at Build about the Windows Phone and Xbox "Threshold" deliverables.