I'm looking forward to this. I read the Gameinformer featured story about it and it looks promising. I loved the dynamic turn based combat found in the Mario RPGs and I'm glad that they're holding on to the original art style rather than attempting 3D.
The screenshots you saw in that video The-Great-One posted is basically what you'll see in game. When people were testing it, they said people walking past could easily mistake that you're just watching an episode of South Park.
I hope the story is good though, as most of South Park's comedy parodies what's happening in the world throughout that week, they'll have to come up with original content over the course of several months, which is looking promising.
And unlike the other South Park games, Trey and Matt will actually be working with Obsidian and writing the story. That, I'm anticipating.