For those mentioning the 12:9 thing... Take that with a HUGE pinch of salt, it's not been confirmed that it's not supported.
The only Bandi Namco games using this flavour of engine (BN's UR4) are fighting games, which don't need 21:9, sucks yea, but I can't see a fighting game benefiting from it. HOWEVER, I agree, it would be nice for the option to be there for said games.
At worst, flawless widescreen will likely release a patch for it.