It does seem likely that the cat familiar skill is the reward, but has it been officially confirmed by Larian? I'd rather not draw conclusions based on random video footage.
Either way I can't say that I'm overly impressed by that skill. It seems decent on its own considering it can be used outside of combat and act as a personal teleportation/exploration tool, but there are already multiple other ways to do that. Not to mention that it probably doesn't have much use in actual combat. I don't really know what I was expecting to come out of it but if that skill truly is all there is to it that's a bit of a letdown.
What did you want? The ability to morph into a were-cat? I think it's a cool little touch and a bit of a pat on the back for completing the quest (if you're not an achievement hunter). Letdown is not the word I would ever think to use.
It's not like you were fighting some super secret mega boss or something.
