They'll probably give Slater & Rhyno the rematch at the Rumble (that's the next PPV with Smackdown guys, right?) and then slow build to Alpha taking the titles off of Wyatt and Orton at Wrestlemania.
I'm not sure who the next challenger is for the IC title. I don't think Ambrose makes sense, really. I'd like to see Zayn get traded to Smackdown and go after it, as he's being given fuck all to do on Raw anyway despite being one of the five best in-ring guys on the entire roster.
Smackdown definitely needs a bit of new blood, though. Their roster is just so thin, and feels even more so with Cena off and Orton about to be a part-timer for a while. I think the main reason they were teasing the Wyatts as defending the tag titles under the Freebird rules is because Orton is working limited dates right now.
I'm really not sure where the world title goes from here. There are reports that Styles might have gotten hurt last night, although the severity is unknown, and the next Smackdown PPV isn't for almost two months so as long as it's a minor injury it shouldn't be a big deal. The Undertaker seems likely, but I too am holding out hope for a Shawn Michaels return leading to a Rumble match. Hell, I wish Michaels would pull a Jericho and just come out of retirement for a year to put on some classic matches with the top talent on Raw and Smackdown. There are a whole lot of potential dream matches there. Styles, Zayn, Owens, Nakamura...I'd love to see Michaels go against all of those guys.