The IOS port of King of Fighters XIII (KOF-i 2012) was updated with over 50 "trading cards," which display character sprites and some new chibi artwork. Some cards also show sprites of characters that don't (currently) appear in the game, including: Geese Howard, Adelheid, Heidern, Oswald, Momoko, Shingo, Igniz, and Mukai!

One would hope that SNK will eventually add these characters to the game, but a few of these "sprite concepts" have actually been around since King of Fighters XII was in development. While these don't "confirm" any characters for the next potential sequel, they do suggest the eventual return of several fan favorites.