M$ has the Weird Maths to decide the name Win 3 - Win 3.10 - Win 3.11 - Win 95 - (Win 97) - Win98 - Win 98 SE - Win ME - Win XP - Win XP SP1 - Win XP SP2 - Win XP SP3 - Vista - Vista SP1 - Win 7 - Win 7 SP1 - Win 8 - Win 8.1 - Win 8.1 update 1 - Win 8.1 Update 3 - Win 10 - (Win 10.1) .......BLAH BLAH..
AFAIK it will just be called Windows 10, but updated on the distribution side. People who handle the files will probably refer to it by build number or "Fall Update 2015"
I would suggest "Windows 100" = Windows is now 100% Fixed (Because giving for free means they are looking for 100% users too) - Guess whose DREAM?