Who cares? In reality, it's just Windows 6.3. Microsoft hasn't delivered an innovative update to Windows since Vista. Windows 7 was vista with a UI overhaul, the Windows 7 operating system is still versioned as 6.1. Not to put down Windows 7, it was nothing but an improvement to Vista -- Windows 7, in my opinion, is the end of the line. Microsoft will never top it. Windows 8 is absolutely horrible -- whatever guy decided that they should throw out the start menu, one of the greatest features of the Windows UI, and replace it with some forced tablet-friendly squares bullshit needs to be shot in the dick. Windows 10 looks like a step back in the right direction, although the stunt they're playing by naming it Windows 10 is unnerving. Multiple desktops sounds neat in theory, but it's something that could've easily been accomplished with some third-party software and doesn't really say anything for the OS itself.
I suspect Windows 10 will be usable, with some modifications. I'm sure the first thing we'll see is a mod to opt out of the stupid squares in the start menu bullshit, and then it might be like Windows 7 with whatever new fancy additions Microsoft has been able to come up with in the past nine years, since the release of 7 in 2005. My only concern is that they seem to be locking down their software more and more. Everyone saw how Microsoft wanted to release the Xbox One. Always on, some creepy stalker camera shit. Wouldn't be surprised if 10 requires internet activation or some shit.