The widely held belief is that Brock Lesnar would be immediately booked into a rematch against Alistair Overeem if he decides to return to UFC. Overeem was the person that defeated him for the heavyweight championship before he decided to retire from MMA and return to WWE.
In a move that might have been encouraged by Dana White to promote the potential return, Alistair Overeem called out Brock Lesnar after defeating Frank Mir at a UFC event this past weekend. Lesnar is attempting to work with WWE on making his MMA return possible.
Word going around right now is that WWE will throw Brock Lesnar into a quick feud with Mark Henry to build him back up again after a lengthy hiatus from the company. The former UFC champion is expected to show up on television in a few days.