It will be interesting to see what Windows 8 brings to the post pc world.
Actualy I think W8 will be quite a success. Metro seems strange to many ppl on first sight, but the thing is Metro !=W8. Metro is part of W8 on normal computers you can always switch to the usual W7 alike environement.
I was working on something like Metro for my Efika pictureframe long ago (spend not too much work on that and came not very far). A simple interface to do most things conveniently and just switch to the full blown desktop when necessary. I think that aproach is a rather good one. Providing something simple, but don't restrict it to that.
For phones I already said I would not be too surprised if Nokia will make a comeback over the coming year or two. They build quality and have enough experience with phones. Of course it is sad they don't follow the Symbian and MeeGoo route any more, but the hardware and apps by Nokia will probably stay good.
And in the end of day it doesn't matter too much if it's an iOS, Android or WP8 phone - they are all pretty good. Heck, even my simple S60 phone does most the stuff I want it to do - albeit this device is really far from being perfect. But it works, and honestly if I got a replacement phone that would be no necessity but pure luxury.