Don't know much about it yet, but it will be a 10" tablet upon which slabs of awesome will be served.
Unfortunately it won't go 4G unless you plug in an external modem. Yeah, right.
Motorola Xoom Only Goes 4G LTE With External Modem
I've been very interested in seeing both this and the BB PlayBook, for myself.
My dad and my brother-in-law both got NookColors (which we rooted for Android) for Christmas, just because $250 for the quality of the hardware+accessories and how thin the thing is was hard to beat in that range. On the go, they're both using them tethered to their smartphones. It's a neat little alternative while some of the prices on the other stuff settle themselves.