Something I don’t understand about Microsoft is its obsession about new kernels. While I can see how a foundation of a building is important, changing it all the time damages the OS more so than fixing it. Imagine a hotel that does not understand why guests aren’t coming, and their solution is to rebuild the foundation of the building? That wouldn’t fix anything. The problem is in the sales, in the mismatched furnishings, and the vibe.
Mixing WinRT apps and WP8 apps on one platform will only result in one thing: A user experience disaster, found especially on Android tablets, which attempted similar integration. Most Android developers don’t bother with tablet views, and odd form factors like Galaxy Note can ‘claim’ to have many apps but all with suboptimal experience.