Track bikes do follow the same rationale as road bikes, where wheels can be the best upgrade to a bike you can make. I agree with Carlton, that the TK3 is an awesome bike, but the benefits of going to Carbon on the track aren't the same as the road. You'll probably notice an improvement by:
If you're on clinchers, going to a pair of well built tubular wheels
Trying out some race specific wheels
Riding the bike to death. I always ask myself what my bikes owe me, and after a certain point resentment takes over and I try to ride them into the ground. The upshot of this is, I get a lot more riding in anger in, and I get faster.