The big question is still 'will it work?' Will Windows 8 be enough to get MS back into the game? There are two main problems I can see:
1. Microsoft has a strategic problem. They make money by selling operating systems. Their two main competitors, Google and Apple, don't. Will they be able to make Windows 8 financially attractive to tablet developers when they can get Android licence free and they are competing on price with the dominant iPad? Having said that, Android has been struggling on tablets, so there's still an opportunity for Microsoft to get traction in on that form factor.
2. Windows 8 is a hybrid. There's the traditional Windows mouse-and-keyboard UI that they have to keep, and there's the new Metro UI that they want everyone to develop for. What's the experience going to be like for a tablet user when they end up in Windows classic, or for the desktop user when they switch to Metro? The development experience for both sets of UI is going to be very different too, almost like developing for two different platforms. It will be interesting if Microsoft sells a business version of Windows 8 without Metro, or indeed a tablet version without the classic UI.
Despite having raised all these questions, I do think Microsoft have a workable strategy for Windows 8, and it’s going to be an exciting time over the next few years to see how it pans out. There is still a window (sorry) of opportunity in the tablet form factor for Microsoft to challenge Apple id they can get this right. Let’s hope they can.