I came across the official Blokus site today and discovered that Rumis has been redesigned as
Blokus 3D. I took a look at the rules (a downloadable PDF is available on
blokus.com) and it really looks like they've just renamed the game and put the Blokus style on it. I don't see any rules being different. In any case, Blokus has become quite popular now, at least based on what I've heard from several casual gamers. So, if you're familiar with Blokus, but don't yet own Rumis, you might want to check out
Blokus 3D.