and Windows Phone are sound there are two concerns I have with this:
Microsoft hasn't said anything that remotely resembles this senario. After the last debacle over Silverlight's "death" you think Microsoft would have learned about the importance of keeping their dev's informed and being at least remotely honest and transparent with us.
I am still holding out hope that they want to make some big splash at Build by announcing Jupiter and the ability to write an app once and run on xbox, phone, and pc. It's my last thread of hope before the HTML+JS apocalypse.