As per the info, Microsoft may soon talk about the Windows 10 Mobile SKU, which has been earlier confirmed to be same for both Phone and Tablet. In January 2015, around early 4th week, Microsoft may talk about the Windows 10 mobile SKU and next version of Windows 10 for desktop.
It is not clear however, when it will be released as developers preview update and per tipsters, it may not be before April-May now, when one can expect it rolling to dev preview devices. Though, it may release before or even after that timeline.
The Windows (Phone) 10 may bring some new features like side-by-side split (snap view) multitasking, FLAC support, some UI changes and more to Windows Phone and Tablets. Earlier we heard about actionable notifications too, but that may not arrive initially, sources indicate.
Stay tuned for more on this!!