As of now Microsoft are expected to unveil Windows 10 for phones on January 21st, alongside some new features of Windows 10 including the all new Spartan browser. According to ZDnet’s Mary Jo Foley we can expect a public pre-release of the software through the new Phone Insider app shortly after the 21st.
@MarcinBlocian yep. Public preview expected some time shortly after Jan. 21 event
— Mary Jo Foley (@maryjofoley) January 11, 2015
Hopefully we’ll able to get out hands on the new software soon enough, and take it for a spin on our devices; instead of having to wait till the second half of 2015 for a flagship running Window 10.