Starting in February, Doodle Jump users will be able to download a free software update that lets them unlock an Easter egg level (fitting) where they can play as the Easter Bunny character from Hop.
In the meantime, though, we'd guess that this update may not be worth hunting down to the degree that the new iPad 2 was -- the level of shrinkage here doesn't seem enough to have a huge impact on power draw, and in any case that's less of an issue for a device that's fed from the wall.