In a recent interview, the game's producer revealed the the series' tradition of multiple endings will continue.

Speaking with OXM, Dead Rising 3 producer Mike Jones said,  "I think typically we've always had about somewhere between six and 10, something like that. There's a handful of branching points that make a significant difference, and whether you're able to play beyond the normal timeline or not."

He went on to mention Overtime mode. ""Previous Dead Risings would always have modes like the Overtime mode, where you get to discover the truth behind everything that's been going on," Jones said. "So there's not just the six days, we're going beyond that if you make the right story decisions. So it's not like choose-your-own-adventure crazy infinite endings, there's a finite amount, but they all [correspond to] meaningful story decisions that you make as you play through."

OXM also reported that a side story in the game will play out through Microsoft's SmartGlass tablet integration.

[Source: OXM 1, 2]

Our Take:
After some panicked that Capcom was breaking with the traditions of the series with Dead Rising 3 (thanks to an overly serious debut trailer), all the newer information about the game seems to suggest that these fears were misplaced. I'm also curious as to how the SmartGlass integration will work – not many companies outside of Microsoft seem to be pushing the technology. 

For more check out our video interview with Mike Jones.