I'll stick with the majority opinion - combat is more challenging and varied, at least in the small part I've seen so far. A couple of previously weak skills, such as First Aid, have been upgraded. Overall, a good turn-based action RPG without much micromanagement.
Returning to a fresh incarnation of Exile/Avernum after all these years has charm all by itself.
I think the combination of good parts from Avernum and Geneforge worked out, although I must admit I was dismayed when the first screenshots came out.