I wonder if tying this to the windows store is a good move. The reception thus far hasn't been extremely encouraging.
I own a Chromebook precisely because it's limited in the software it can run. Other people own it because it's simple to own and use. Restricting to the Windows Store is a good move for security, but I'm not sure the different groups of customers will take away the same message.
Some people will see it as a move to water it down or take away features while others will see it as a positive step toward improved security.
I'm not envious of the tightrope Microsoft has to walk to set the right expectations from their customers. If they're smart, they're going to make simplicity and enhanced security the key features. If they're not so smart, they'll be emphasizing the "one windows" message they were pushing a few years back.
Then again, I've been wrong before.