[image=http://e3.nintendo.com/_ui/img/games/ds/kirby/s3.jpg]
I believe these images tells the most about the game. It shows that most or all of the action will take place on the touch screen, with the top screen acting as the score keeper. It also shows that getting a new Kirby is achieved through some sort of bar that goes up as Kirby eats more and more things. As the E3 page shows, medals can be collected in each area to unlock hidden goodies, such as Mini-Games and presumably colours and possibly artwork. The game looks casual enough that getting all medals doesn't seem like it'd be required to get the final final boss. Finally, it confirms that Kirby will get abilities and that presumably, that ability is shared among all the Kirbies on the screen.
Looks interesting.