I know Triple H will be at WrestleMania but will Undertaker be there?

Triple H announced of course, he will be at Wrestlemania 27 but can come back earlier if maybe he is healthy enough. There is speculation that Undertaker might not, because of his recovery from his surgery and everything. I just hope Undertaker comes back by WrestleMania 27 at the latest because its not the same without him and he is undefeated and the other thing, its the anniversary of his winning streak. But, I do feel like he will be back at the earliest WrestleMania because WWE can't afford to bring him back earlier and then get injured again. Do you think it will be Triple H? or someone else? This is probably his last WrestleMania and will win so his undefeated streak will last forever. Will it be against maybe? John Cena? Triple H? or someone else? They already have the signs with UnderTaker and Triple H on it and its false advertising to see Undertaker on the poster and him not being there, there are a lot of fans to just go and see UnderTaker, period. I am a huge UnderTaker fan and will be sad that next year is his last year then will retire and then get inducted to the Hall of Fame later. Any thoughts on who will be his opponent and do you think he will make it back in time.