Although lacking any facts, more like rumors and 'what I'd like to see' - I like that reset idea. System restore is kind of both complicated and semi-working. Maybe I'm missing something, but I created a named restore point and several application installs later it was pushed out by automatic restore points created 'for me'.

App store, done right, would be huge. And I know it might not sound popular, but Microsoft buying Steam from Valve or making their own would be a bingo for Windows. They kind of have that Live Games now, and Valve's core business isn't Steam anyways.