I've been lucky enough to spend the past couple weeks with a pre-release version of the game and it's quickly become one of my iPad favorites. You'll have to reconfigure your brain slightly to adjust to its particular brand of ambient play: though it shares some of the same basic consume-to-consume-more mechanics as something like Katamari, attempting to approach it with the same carefree knockabout spirit is a quick way to instant failure. Instead, you'll need to more slowly and strategically work your way around each level, looking for openings and playing the waiting game.
Hemisphere have more information on the new additions to the iPad version (and the iPhone version to follow a month later), and, coincidentally, Steam has the PC and Mac version of the game currently on deep discount for a mere $2.50 to give it a whirl ahead of time.
Osmos for iPad, coming July 8th [Hemisphere]