The talk backstage is that Paul Heyman will be in the corners of both Brock Lesnar and CM Punk for their respective WrestleMania 29 matches.
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Could see this being an indication that we will see Punk Vs Lesnar down the line.
Say Heyman is with Lesnar backstage at Mania, Punk walks in and says he wants to talk to Heyman etc, the pair square up over it, stuff along that line to tease a potential feud between the 2, with Lesnar recently having signed a new contract Punk must be near the top of the list of potential opponents.