The new levels are interesting. Havok is basically a bunch of square rooms interconnected either by flat hallways, ramps going up, or ramps going down, and there are catwalks over everyroom, so you literally have people coming at you from any angle.
Fortress is awesome, but huge. Lots of colors in the various areas. It's like a mix of the prison at Iacon, with an actual military base with catwalks, big, grated ramps going up in huge chambers, and lots of side rooms and halls that have various themes to them (one is like a generator room, one is a command room, one is a torture chamber, one is the prison, etc.). Very neat map, but tough to get around right now since I haven't played it enough. There's no way to specify what level you want to play.
The escalation maps I played only briefly. Autobot one feels WAY more open than the last, essentially a bunch of wide open streets, courtyards, city squares, etc. instead of just a single street and buildings/rooms around it like the last Autobot map. I got swarmed on my own pretty quick.
The Decepticon one I didn't get to play in for more than maybe 30 seconds before dying. It looks like a big...building that you're running around rooms inside of, I think. I was playing Onslaught and did something really stupid (see above where I mentioned what NOT to do when playing him).
Well worth the money, though. And I hear the mortar launcher weapon got improved, too (more damage, sped up time between shots).