I would be amazed (in an awful way, of course) if the EP was Bride and the three bonus tracks that are already on sale. I mean, that would literally be the stupidest thing they could ever, ever do. Not sure Razor & Tie is above doing the stupidest thing they could ever do, but I like to hope if they put out a whole new product, it will actually have new material on it.
V mentioned that there were songs that were left on the cutting room floor because they weren't perfect for the album, so maybe the EP will be Bride, an acoustic version of Bride, and one or two of those. If it's a digital only, then my guess is it will also come with the Bride video, as well as a "making of" video or something along those lines. I just can't imagine they would phone it in THAT much to give us something we already own.