As of this past Tuesday night, the following matches are planned for WrestleMania XXVII:
Already Announced Matches:
The Undertaker vs. Triple H
WWE Championship Match
WWE Champion The Miz vs. John Cena
World Heavyweight Championship Match
Edge vs. Alberto Del Rio
Randy Orton vs. CM Punk
Jerry Lawler vs. Michael Cole (with Jack Swagger)
To Be Announced Matches:
John Morrison, Kelly Kelly and Trish Stratus vs. Dolph Ziggler, Layla and Michelle McCool
Ezekiel Jackson, Heath Slater, Justin Gabriel and Wade Barrett vs. Big Show, Christian, Kane and Kofi Kingston
Cody Rhodes vs. Rey Mysterio
WWE United States Championship Match
WWE United States Champion Daniel Bryan (with Gail Kim) vs. Sheamus (with Brie and Nikki Bella)
A yet to be determined Divas match. Possibly a battle royal.
Finally, a Money in the Bank Ladder Match is not scheduled for the event. That could easily change though.
Of course, creative plans change on a daily basis within WWE so please keep that in mind when reading the above rumored matches.