[start rant]
When anyone restricts your freedom of choice "for your own good" I see huge warning flags...
Next is "we know better what you want/need", and then "fill out the forms explaining why you think you need that software or hardware, we will reply after the mandatory three month waiting period".
If I wanted someone to tell me the software and hardware I need, I'll buy apple (note the mouse over).
[/rant]
Unless MS wants to be called MicApple, I hope they take a slightly different approach.
'You can get fully tested and safe Metro software from the MS app store or take the risk upon yourself and get freeware / open source software.'
Then give the recommended checks you should be doing for non-app store software.