After speaking with sources I have learned the early plans as of now for next year's WrestleMania 28 card.
Obviously The Rock vs John Cena and the plan is to have the WWE title be on the line in that match.
The Undertaker vs Chris Jericho would also be on the card. A rematch between Triple H and The Undertaker is rumored to take place at this year's SummerSlam.
Triple H would go to WrestleMania next year going up against The Miz.
Alberto Del Rio vs Randy Orton.
Sin Cara vs Rey Mysterio.
And the celebrity involvement that the WWE is hoping for is Big Show in a match against retired NBA star Shaq.
These plans are all subject to change between now the start of 2012 based on injuries and other factors. As of now, this is the card that the WWE is looking to have for WrestleMania 28 in Miami.