Looks like button-bashing fun. I can't imagine it's going to be any more taxing than that. If it's anything like the Marvel/Hobbit/Potter etc games then it's generally a case of smashing and building stuff until you get to the end of the level. It's the jokes and characters that make it fun, so it remains to be seen what cool new minifigs they introduce for it.
I really hope that Pieromancer isn't the rumoured wizard for CMF series 13, he looks basically like the fantasy era evil wizard with a cone hat.
Funny that it's suggested rating is 10+ (or was that just the trailer?) as I'd imagine LEGO's target audience dips a bit below that age as well.
Less talking, more MOCing.