Yeah I have been trying to work out what it is as well, I got an alright picture of it a couple of weeks ago and it looks small. I would guess that it is custom built as I haven't seen anything like it either.
He uses the mixer for most of the lighting, thats a Xone DB4. It send midi aswell as being the dogs bollocks of a mixer.
Heaven knows what that controller is underneath. A custom bit of kit made especially for him so it seems!
I saw him play on his traktor setup and from what I could see he still uses his lappy a fair bit for searching, may be that little controller is effects presets or something? To be fair, you can make any midi control do pretty much anything you want in traktor, so it could do a million things, or maybe just one!