Goeniko's the character that's been teased for a future update, as far as I can tell, though I'm not quite as interested as I usually would be due to seeing her so much in Mugen already.
As for cheating, if I remember correctly, you can easily find the values for most things in Cheat Engine without having to do any kind of fancy work (i.e. 4 Bytes). What I did was find the values for the money so I could easily buy as many drinks and such as I wanted, as well as giving myself an unlimited number of the special move to spam. That made things pretty easy. If you want to make things really simple, though, I believe replacing the 177setting.ini in the main folder with mine should give you everything in the gallery (it seemed to hold the save data when I tested it, though if it doesn't, someone please let me know).