I don't think Microsoft is merging both UIs at all. I think MS wants to pretend that Metro is something you'll use with keyboard and mouse, but I bet you won't,

I don't think Microsoft is merging both UIs at all. I think MS wants to pretend that Metro is something you'll use with keyboard and mouse, but I bet you won't, and they know that. My thinking is that MS wants to sell you a hybrid tablet device. By day, you have it docked, and you spend most of your time in Desktop with mouse and keyboard. When it's going home time, you pull it out the dock, and it becomes a touchscreen tablet where you spend most of your time in Metro.