Tekken Tag Tournament 2 is just hitting stores, and already fans have discovered some hidden characters on the disc. These appear to be hints at upcoming downloadable content, distinct from the four characters that were already announced as the first DLC pack.
Joystiq reports that Dr. Bosconovitch, Unknown, Bob, Miharu, Sebastian, and Violet were uncovered, bringing the apparent total DLC roster up to 10. Now before you grab your torches and pitchforks (again), keep in mind that Tekken producer Katsuhiro Harada has already promised any DLC characters will be delivered free-of-charge.
Harada took a hard stance against charging for DLC characters, couched in careful language not to insult Capcom in the process. Even so, he mentioned he understands why characters would be included on a disc, to avoid long download times and allow match-ups between those who do and don't have the DLC. This seems more like a move to progressively reignite interest with some new characters.
Harada was insistent that fighting characters are like "chess pieces," which was his main reason never to charge for them. Presumably, this means Namco Bandai has already done the balance work to make these characters fit into the game proper.