They're riding the one-hit-wonder train as far as they can... and probably hoping something other than that will eventually happen.

"Bounce Evolution" is supposedly the best game available on N900. Although N900 itself was never a successful platform but the game had immersive quality, just like Angry Birds.

[ http://www.rovio.com/index.php?page=bounce-evolution ]

I think that's why they just took in a ton of cash. They need to make more games and I'm sure resources are already stretched thin. Look at some of the best games in the store though - they all involve puzzles and cute characters. Cut the Rope is another example. Keep using the same formula, vary your puzzle types, and push more stuff out that is updated frequently.