Yay! Trine 1 was beautiful, and the gameplay was really solid. I'd highly recommend checking it out to those who haven't played it (or even heard of it). I think you can get it for fairly cheap off of Steam now. And it may be on XBLA, but I'm not sure. Lots of enjoyment to be had, especially if playing with another.
I actually can't believe this is getting a sequel. The original was a physics based platformer that was broken largely because the levels were designed to challenge any one of the three characters, but then you could switch characters at will meaning you breezed past 2/3 of the challenges in the levels. The first one would have been heaps better if the 3 characters were separate and you had to either play them in sequence or switch between them like you did for the Lost Vikings.
One can only hope that they separate the 3 characters somehow in this game. It might make folks forget about Trine 1.