A report by ZDNet's Mary Jo Foley says that Microsoft is slated to release a new line Windows 10 devices in early 2017. This is the reason why the second part of the "Redstone" update for Windows 10 was pushed back, so it would coincide with the next wave of the Windows 10 family.
I'm betting it won't be this year as the rumours are saying it's probably tied to the release of Redstone 2 in 2017.
Irrelevant really as it was needed last year. MS had totally screwed up over the last few years. I just can't get my head around how far behind Lumia's are compared to everyone else in the design stakes. Crazy really as back in the 920's day I felt it was head and shoulders above the competition.