It's doing multitouch right now on my machine at any rate, I can happily touch multiple keys at the same time and it'll play em all on top of each other.
Well, actually, I shouldn't be surprised after implementing it properly today. I've expected multitouch to require some special handling, but apparently it just fires the regular event handlers and issues a pointer ID. That said, it's good to know, one may actually be able to break the dials with multitouch, I'd wager reminding myself of the code involved. I have to look into this (still waiting for my Surface RT).
Either way, this time around, multitouch is implemented properly, especially because in the coming update, you'll be able to actually sustain keypresses, and it'll make the visual key presses and releases work properly (right now, I'd figure releasing one key resets all graphically).