It won't be Hogan, he's done with WWE. They had a falling out a while back, and Hogan is in the process of getting the money to start his own federation to compete against WWE.
With Wrestlemania being in Florida, I'd like to see Ric Flair vs. The Rock. But I doubt that will happen lol
I'd love to see Ric Flair vs. Batista for the WHC at Wrestlemania. Have Ric Flair win the gold in the Main Event on the biggest stage of them all for his final match then retire it on RAW the next night. Flair has always said he wanted to end his career 'on top, and on his own terms' and I think Batista would love the opportunity to face his long time friend and mentor in his final match at Wrestlemania.
It is also likely because McMahon wants Flair to retire so is going to put obstacles in his place as large as he can, so its likely Flair will be in the Royal Rumble Match, and i doubt that they will let Flair's career end by having him thrown over the top rope. And Batista even said in WWE Magazine a few months back that his dream match would be to face Ric Flair in the main event at Wrestlemania