Microsoft has this device known right now as Project Origami, and they are apparently having a presentation tomorrow evening about it.
I found the following video via digg. It appears to be an extended commercial for the device. It’s a handheld do-everything sort of tablet PC that makes me very excited for the future.
Update, 6/26/10: OK, so the original video I’d embedded in this post has been removed from YouTube. I found a replacement!