I'm sad this is just Devil Survivor 2 and not Devil Survivor 1 (THAT story is just fantabulous), but this one is just as good honestly. The Devil Survivor series generally:
Seriously, keep watching it though. I'm not sure how the plot is going to unfold, since there are multiple plot routes in the game, but there are some really awesome things that could come of this.
But yeah, I am VERY excited for this and all the other Persona related anime coming out. This is seriously my favorite franchise when it comes to gaming, right up there with Pokemon. :3