Microsoft introduces Windows 10: recomposing the fragmented operating systems market.

Some days ago Microsoft introduced Windows 10. The first thought I had has been "They'll have a lot of work to do recomposing their fragmented operating system market". Why did I thought that?
I did because, just to give you a hint of how many Windows products exist in the consumer market, when I have a request for support and I'm asked about a specific button or function or menu, I have to ask "Ok, which Windows do you use?" or guess, by the description I've been told, if it's Windows 7, Windows 8, Windows 8.1 or, sometimes, the eternal Windows XP (thank God, almost all the Windows View computers died during the years as a sort of natural selection and no one dares to install it on the home pc).
One of the biggest industrial innovation coming with Windows 10 will be the free upgrade, for a year, from Windows 7 on. This practice, lent from the Apple's OS X recent trends, started shyly with Windows 8.1 but that is considerable as a separated case: Microsoft wanted to fix the terrible Windows 8's feedback and, after a year and half of upset users all around the world, they did it giving everyone the Windows 8.1 upgrade for free - which passed as a minor upgrade, almost like a patch, but demonstrated to be something faster and easier to use and configure. Now, this new OS is presented as a milestone too, and it's supposed to simplify the whole Microsoft software products list leaving, hopefully, only XP and 10 in the pc market.
This release contains a million of breakthroughs, like the new rendering engine for games and visual effects, the Android-style devices control bar, the graphics "responsiveness", the redesigned Start menu which includes the old-fashion shape and the ultra-recent tiles too, the unification with Windows Phone and XboX environment, the introduction of Cortana - something impressive that really looks like a human mind living inside your device - and, as a side application, the most futuristic product at all: the Microsoft Hololens. If you don't know what they are, jump at 2:31 of the video at the bottom of the post and keep your jaw tight. These device has been developed under the supervision of Alex Kipman, a guy that sounds to deserve all your attention. Another remarkable thing, although it's something not completely new, is the Windows Store section, which is finally getting quite crowded of apps. This is a big plus - even if late - especially considering the rain of Intel Atom/Pentium processor based Windows tablet. Acer, Asus, HP, Lenovo and Microsoft itself are releasing a huge number of devices under 10 inches ready to be used exactly like a pc - and not as a scale blind version of Windows (remember the awful RT?).
The question for me is: will I leave linux for a full-time use of Microsoft Windows 10? And what about you? Will you perform the free upgrade?