That video just recently showed up on YT… a battle during the BW “demo”. So that means it is out folks. Nothing new was revealed by this, but what we have now is the hope that more screenshots and better video are to come now that Nintendo is testing these demo games. :3 As a sidenote, this could be fake.
ps- I have a job interview tomorrow wish me luck!!
BTW- if anyone is wondering how one can go about faking this, there are homebrew applications that could be run allowing video to play through both screens, making it look like a DS game is running. I use an acekard 2i and I’m sure that there would be a way to do it.