The spot involves a mom-type lady, a teenager and a young kid trying to catch a bus. They miss it, then sit glumly on the bus bench and pull out their Nintendo DSes. The mom draws a bike, which appears, then she pedals away. The teen draws a sports car, in which he zooms off. The kid draws a Pterodactyl and flies off on the winged lizard. Bam! Lights down
Hmm! Well, I'm usually not a big fan of game commercials, but this sounds interesting. It's hard to ease the casual/typical gamer into the concept of Scribblenauts, and I think the progression from bike to sports car to peterodactyl is a good way to explain it.
So again, this is merely a rumor, but if it is true, I can assure you we'll have video footage of it the moment it pops.