RPG with lots of combat.. yes, maybe bit like Dark Messiah. Not much combos and such, but definetly good combat. It has lots of story in it too. Reminds me Divinity 1.. Only bit less of story and more killing things.
Engine.. heh, I would like to know too. My guess is that its Larian own engine.
What to expect? Nice RPG that will please ppl that played Divinity 1.

At least it pleased me and I played only that one.. (rest kinda wasn´t my cup of tea, first is simply best for me, but this one is quite close.. could be better ofc).