The Surface Pro DOES have a Wacom digitizer.

I'm currently at my local Microsoft Store (typing this from the display model Surface Pro's Touch Cover, actually), and I've confirmed that the Pro's digitizer is at least compatible with Wacom styli. I grabbed the stylus from one of the Samsung display machines, and it worked on the Surface's screen. That makes me especially happy because I'm not 100% happy with the included stylus - it's a bit too low-friction against the screen.That said, I'm very happy with the weight and size, and I'll be going through with getting one on Saturday morning :)