I love Kinect as a technology, but for games? It's never really worked well for me -- with two exceptions. The first was Child of Eden, the second? Fruit Ninja Kinect. Now, thanks to a rogue classification decision, it looks as though the existence of Fruit Ninja Kinect 2 has been outed!
The original Fruit Ninja Kinect was developed in house at Halfbrick, but it appears as though development for the sequel has been outsourced to a studio called Hibernum, which has been responsible for a few licensed mobile games likes Disney Infinity Action and Scrabble. They've also worked with Ubisoft on certain aspects of Assassin's Creed.
I always thought that Fruit Ninja Kinect was one of the few games that actually worked well using Kinect. The slight lag was never a problem, and two player was a blast -- so long as you weren't wearing a left arm to the mouth courtesy of your opponent. I'm keen to see how the sequel turns out.