Considering the care with which Disney is managing Big Hero 6, we're unlikely to see characters from the Oscar-winning animated movie appear in a traditional fighting game. However, if you were curious how a San Fransokyo tournament might play out, this video gives an idea.
Modder Salim transformed Zangief into Baymax and Cammy into GoGo Tomago, pitting them against each other in Capcom's Ultra Street Fighter IV. It's pretty impressive handiwork, as you can see in further detail from the Baymax skin below.
No other Big Hero 6 matchups have been released, but perhaps we'll see Honey Lemon vs. Wasabi soon.