well just wait until tomorrow, I'm heading out to my local game dealer in Japan in the morning to buy a dsi. Once I get it, I will tell you guys if the dsi is flashcart compatible.
if they get permission from 4j (the studio who helped put minecraft on consoles), they could put the console edition tutorial worlds in the game, as seeds
and i mean all of them (if not, maybe a few highlights, like TU1, TU31, and TU69)