Its official Brock lesnar will be staying with WWE.
Which at least means there's theoretically some possibility of him retaining now, although given Vince's stubbornness of getting what he wants, it's still highly unlikely.
I don't think we'll be getting more appearances out of Brock than before. They've hyped him as as a rare attraction, and if he loses the belt at WM, there will be even less need for him to appear at every PPV. Given how tough the negotiations have been this time, I don't think Lesnar is budging to give them more dates. It will probably be the same contract as before.
The biggest surprises to me would be Reigns not winning the title (whether it be by Lesnar winning, or Rollins cashing in), and Rusev beating Cena again. Given that Rusev won their last PPV match, and got the better of Cena on Raw, it seems all but assured that Cena is intended to win the feud at WM.
I'd also be shocked if Sting lost (one of the very few times I'm going for HHH, which says a lot about how much I dislike Sting). I expect the WM match is a one off match for Sting, so I can't imagine any scenario where he signs a contract agreeing to job to HHH at WM. That's not how WCW veterans are used to working.
I'm still 50/50 on how they'll go in the Undertaker match. I don't think Wyatt deserves to even have a match with Undertaker let alone win, but for some reason they think a fat hawaiian shirt wearing redneck is the next Undertaker and might think it's "passing the torch", and now that Lesnar has taken the flack for being the one to beat the streak, they might think fans are more receptive to Undertaker losing now.
Rollins really needs the big Wrestlemania win over Orton, but they're still treating him like a pipsqueak heel, and Orton just came back and they think he's a big deal. If Rollins does win, it won't be cleanly.
I'm expecting Bryan to win the ladder match, but there are several legitimate contenders in the match, all deserving.
They'll probably continue to make the Bellas look ridiculously strong and flatten Paige and AJ, but I'm hoping Paige and AJ win.
There are a number of ways they could go for the Battle Royal, but I expect Sheamus will return and take it. It's a shame they squashed Axelmania on Raw, because having him win would have been hilarious.