I think it's way too early to tell, but a thing to keep in mind for people saying "Sony's funding, any Super could contain code from the base game, will never happen" is that this sort of thing has absolutely happened before. A good example in the opposite direction is Mass Effect 1, for instance - funded entirely by MS, and it took time, but eventually EA/Bioware/MS worked things out for it to be ported to PS3. Similarly it's also not happened - Titanfall, etc. These deals are golden handcuff deals, but there are keys in existence, it's just a question of if the publisher in that specific instance is willing to pay the price and sees a decent return on whatever that price is. (For ME1, the cost was, I believe, intertwined with ME3 having MS branding on ads & Kinect support- it being freed up for PS3 was part of a larger deal.)
Similarly, the same thing could absolutely happen to Dead Rising 3 in the opposite direction at some point if they see a market for it. The question is always how worth it it'd be, and how high the hurdles would be to leap over in order to make it happen. I think there's probably more of a market to it for Capcom than with DR1/3 thanks to their eSport/competitive dreams - the wider a base you can spread there the better - but similarly, Sony's commitment to SF with contributing to the prize pool for Capcom Pro Tour significantly defines that right now. The question I'm really curious to know, for instance, is if Sony's commitment to funding competitive SF play is a multi-year deal, or if money from them will evaporate once SF isn't a new, shiny exclusive. If Sony keeps the money flowing, regardless of the details of the deal I'm sure it'd block any later XB release.
RE Super versions or whatever: I don't believe Capcom for a second when they say they're not planning anything other than the base game. They said the same stuff repeatedly during the SF4 cycle. The reason we get these answers is the same reason most devs won't talk about sequels "we're focused on the current game right now! no plans right now! Buy the current game!" Behind the scenes, I bet it's figured out. I expect, like SF4 post-Super, all updates to be available via DLC - it'd be very poor not to - but I also expect at least some of these updates to be branded (and released through retail channels) as 'new' games, just as AE and Ultra were. This doesn't really say if it opens the door for other channels, though - as said above, that depends on myriad factors we just don't know about.