As of right now, WWE still has The Rock penciled in for a big time match against Triple H at Wrestlemania. The reason why HHH is the opponent as opposed to someone like Brock Lesnar or even Seth Rollins is because management is really pushing to get Ronda Rousey to make an appearance at the pay per view. UFC won't allow her to wrestle, but they might be convinced to let her do an appearance at ringside.
September 28, 2015
Reports have surfaced that Tamina Snuka is very close to being ready for a WWE return. She has been training with developmental diva Lina Fanene, who also happens to be related to The Rock. While she may be physically capable of returning, it does not guarantee that it will be happening anytime soon. The creative department is swamped right now because of Wrestlemania, so her return could be pushed back until after that pay per view.
February 7, 2015
At one point in time, there was a lot of speculations floating around that The Rock would work a high profile match at Wrestlemania against Rusev after the two of them worked a segment on Monday Night Raw. Reports have surfaced that WWE has completely taken that off the table. Management is hoping that the Great One works a higher profile match on the pay per view. Many are pushing for him to be in the main event instead.
January 26, 2015