According to F4WOnline.com, WWE has begun discussing early creative plans for WrestleMania 30, and most of the current ideas revolve around whether or not The Rock will commit to working the event next year. As of now, company officials are under the impression Rock will not be at WrestleMania 30, but if he does agree to work the event, the following are ideas currently in play.
Should The Rock agree to work the PPV next year it's likely he will resume his 2002 feud with Brock Lesnar and face him at WrestleMania.
This would leave The Undertaker's streak being put on the line against Ryback, and the idea would be for Paul Heyman to lead a physically large wrestler to face 'Taker and do what CM Punk could not do the year before; end The Dead Man's streak. This storyline, as much as it relies on The Rock working WrestleMania, also requires the current pairing of Heyman and Ryback to be successful. If things do pan out this way, WWE has thought of Ryback potentially being the man to end the famed undefeated streak.
Should The Rock decide against working WrestleMania, the plan would then be for Brock Lesnar to face The Undertaker, and it's unknown at this time who that would leave Ryback to face.