I picked this up on XBL, and i'm wondering if someone has a list on how to unlock all the bosses? 
 
Also, do you guys think this will be a good refresher for KOF13?

Considering this a a remake of a game on the Neo Geo AES/MVS, I would say this is not really a good refresher. KOFXIII is going to be using the new sprites from KOFXII, plus new characters added into the roster, with a different system. This is a classic KOF game, team match with the old POW system. Break a stock, get a power boost, or use and additional stock while in MAX mode to do a MAX SDM. Its fun to play, and a good reminder of what the KOF games used to be.