The game is pretty much unchanged. The song is amazing.
There appear to have been a few modifications that appear to just provide better post-gobble ball management. The hippos look pretty much the same, tho now in a more modular unit.
I had a friend who had the timing down on flipping a ball from the reservoir and grabbing it perfectly with his hippo. Sucked to play with him.
My preferred game was the Rock'em Sock'em Robots.
Hungry Hungry Hippos via Amazon