If you're curious as to how this massive crossover from Namco Bandai, Capcom, and SEGA works, don't hesitate, and watch the above trailer. Although we already had a smaller two minute sample, this giant new 10 minute blowout showcases a ton of content, from the game's grid-based movement, to combat involving up to five teammates.
As Jonathan Holmes has pointed out in the past, this looks like a more coked out version of Namco X Capcom. Simply put, they really aren't pulling any punches with this game. In addition to the large cast we already knew about, the trailer features classic settings like Dead Rising's Willamette Mall, showing that they aren't going in half assed.
If you watch the end of the video, you'll also catch what seems to be a limited, or collector's edition version of the game. I have never hated the term "region locked" as much as I do now.