I just played the Dead Space 2 demo and I have to say I am thoroughly impressed. The first couple rooms with the dementia-based flash-back gave me the skeeves. The narrow corridors initially didn't frighten me, but when I was attacked from every direction by Pukers and Slashers, I was running back through rooms to be sure I had some distance. Absolutely phenomenal. Brand new scares and weapons had me trying new tactics. The slightly different control scheme isn't a bother, nor is the non-dynamic weapon cursor.
It's safe to say I will purchase this game on January 25th.