This is a mix of what I think/want to happen at mania. Excuse me for any spelling errors
1. PreShow for the US Title Cesaro (C) vs Jack Swagger
Cesaro has been saying no American can beat him for the US Title, Maybe former world champ and returning face Jack Swagger could be the guy to beat him.
2. Mysterio vs Sin Cara w/Hunico and Camacho
Everyone says this is going to happen but I have Sin Cara turning heel due to the fact he is not really over as a face anyway. Maybe he could start a faction with Hunico and Camacho. Or perhaps Sin Cara could say he is jealous of Mysterio and has paid off Hunico and Camacho to jump Mysterio several times before various tag matches.
3. Flo Rida vs Heath Slater w/Mahal and McIntyre
This match looks like it is going to happen. Probably just Flo Rida squashing Slater, maybe if the match doesn't happen they would do a sing off of sorts that would lead Flo Rida embarrassing 3MB somehow.
4. Divas Title Kaitlyn (C) vs AJ w/Big E Langston
Due to the long standing friendship from NXT into the main WWE roster these 2 divas could face and see who the better person is at mania
5. Tag Team Titles Rhodes Scholars (C) w/Aiden English vs Miz and Morrison
I see Rhodes Scholars winning the tag titles around rumble/elim chamber time when Hell No eventually go their separate ways. Sandow has been looking for an apprentice and I think Aiden English from NXT would be a perfect fit due the amount of intelligence and class he shows during his matches. Also I think WWE may bring back a midcarder and if Morrison is one of those people then you might as well team him up with Miz.
6. IC Title Barrett (C) vs Kane
Just a big man match. If Barrett beat Kane at mania that would help elevate him and perhaps he could drop the IC title at a later date and be in the hunt for the world title sometime in the summer of 2013.
7. Dean Ambrose vs Daniel Bryan (Shield and Brad Maddox banned from ringside)
dream match IMO, 2 great wrestlers going at it. I have a feeling Maddox would join the shield somehow and reveal he is part of the shield before mania. Just to make it fair one of the GM's ban the shield from ringside.
8. Ryback vs Big Show
People seem to say this match will happen just because WWE wants Ryback to have his "WrestleMania moment" by shellshocking Big Show. Perhaps Ryback could cost Big Show the World title at the chamber ppv. Big Show would eliminate Ryback but then Ryback gets mad and beats up Big Show which causes Del Rio to win. Big Show would then want his revenge on Ryback.
9. World Title Ziggler (C) w/AJ and Big E Langston vs Alberto Del Rio w/Ricardo
Alberto Del Rio wins the elimination chamber match but Ziggler cashes in afterwards and wins the belt. Then Del Rio gets his re-match at mania
10. Lesnar vs HHH No Holds Barred
Lesnar comes back at the 20th anniversary of RAW and HHH returns too and wants revenge on Lesnar from summerslam and challenges him to a No Holds Barred match.
11. Randy Orton vs Sheamus
2 of the top faces on smackdown facing at mania. personally I think it would be a great match. They have sort of teased it on smackdown leading up the the rumble as well.
12. WWE Title The Rock (C) vs Royal Rumble Winner John Cena
Sounds like WWE are going to do this again with Cena winning the second time round. I don't really want to see it.
Rock beats Punk at the rumble, retains in the chamber and the royal rumble winner Cena challenges the WWE Champ the Rock.
13. Streak on the line Undertaker vs CM Punk
WWE seam to make every undertaker mania match bigger and bigger each year. This is obviously a dream match and CM Punk has evolved a lot since their feud back in 2009. Why not have the man that has held the WWE Title for over 400+ days in a row challenge the deadman?