Sucks about the release date (good thing I haven't pre-ordered yet), but holy hell, this looks awesome. I finally get how the Final Smashes fit into the game, and I think it was a great idea. Wish the guy in the Samus vs. Mario video had kept the camera on for a few seconds longer so we could see the result screen, but whatever. Sweet!
PS, the game looks great graphics-wise, more than I was able to see from the screenshots uncontextualized videos from before. On the Wii I've really only played Zelda (originally for the Cube), WarioWare (not a powerhouse by any means), and Metal Slug (old, old stuff) so I was pleasantly surprised by how smooth everything is. It almost looks 360-quality, though I'm sure I'll get beaten down for that rather quickly.
P.S.S. Advance Wars? Hells yes.