Just watched the Nintendo Conference thru Gamespot Live. I'm putting up a transcript now on our site (trigames.net) as best as I can transcribe it, but from what I've seen, the DS is indeed that model that was shown in USA Today. They showed an awesome looking Metroid on the bottom screen with an accompanying map on the top screen. The quality was hard to judge because I was watching it through a blotchy, compressed video stream. But it looked almost as good as the Cube version. It could possibly have been an FMV super-imposed on the bottom screen, but the speaker said that the game would be playable on demo DS's tomorrow, Wednesday the 12th. He also noted how you would use the stylus or your finger to point where you wanted Samus to shoot. The crowd erupted when they saw this, although it wasn't the first nor last time they would cheer in ecstasy.
The DS will support local 100 ft area network, I think that's what the Blue Tooth refers to, but I'm not sure. It will also support Wi Fi access, piggybacking on internet technologies. Browsing and such, I dunno, but I know they were touting it for game use and communication. The "instant messaging" appears to simply be the ability to talk to other DS users using your stylus to write and draw pictures.