Hmm, well it seems like companies like xiaomi, cube, TCL (altacel), or HP may release windows products, given its currently a niche without much competition, unlike android.
I can see windows cloud coming out this year, and I expect windows on arm to come out this year too - but the initial focus will be on killing the chrome book, and broadening MS's tablet marketshare.
I am fairly confident we will see windows on ARM this year, along with windows cloud - so that's two new editions of win 10 - on arm, and cloud IMO, this year. But the focus won't be to run straight to mobile. It'll be to extend that tablet share and reclaim that budget laptop share.
I also see Cortana's bot intergration happening this year, and likely WM will get that, seeing as they have Cortana, which will bring quite a few new tricks, like getting local news via voice, voice based games, booking hotels/taxis via voice and more. As the "skiils ecosystem" of Cortana expands, it will become fully viable as a primary control, which opens up smart IoT devices a lot.
But I don't think MS themselves will release a mobile device this year. They MIGHT, and all this downplaying could be to increase impact of an unveil, but I suspect the surface phone, and its new form factor companion will come next year.
The again, it could all come late this year for all I know. MS is good and hinting, but it keeps cards up its sleeve every time.
I have a weird feeling we might see a watch. Or some kind of wearable. That might also have phone and LTE capability. It would sort of fit, with the Cortana bot intergration, to come out with not just a smart home device, but something else primarily voice operated.
Definitely with so many pies in the over, something will come for mobile in the next two, from MS, hardware wise. In the meantime, I doubt it will be a quiet year on the software front, and I would not expect a complete absence of third party products either.