Its still pretty early, And I don't know of anyone with a canned tune yet. I have spoke with overkill Diablosport and IPF they all have plans to do it.
I know OVERKILL is looking for someone to work with on a LGX V6 tune and I am keeping a close eye on everything else for the V6 you can reference this thread here.
http://www.camaro6.com/forums/showthread.php?t=447184
So the only tunes you are going to find right now is someone who did a pro tune and I havent seen anyone speak up yet!
BUT!! dont hesistate to follow the cadillac ATS forums either since it has the same engine it can give you idea
Trifecta should also be coming out with something I would think.
Hope this information helps