Probably for the wrestlemania in 2012
Undertaker will make him return on Wrestlemania. He is still recovering from Surgey. By the time Wrestlemania comes around he will be better.
Sometime B4 WrestleMania 27
he will return two weeks before wrestlemania 27 to call out undertaker for a match WM 27
he can return to wwe either survivor series or royal rumble or wrestlemania 28
after the loss to undertaker at wrestlemania 25 he will return but after the loss to undertaker in wrestlemania 26 he may never return however some say he is gonna return and fued with chris Jericho
he willl return in the royal rumble in 2011 or wrestlemania 27 in 2011
at Wrestlemania 27
The Undertaker is still signed with WWE. He is currently inactive, due to recovering from a shoulder injury. He is expected to return at WrestleMania XXVII (27) or possibly Hell in a Cell or Vengeance (According to WWE Magazine)
At WrestleMania 1, The Undertaker did not wrestle anyone. The Undertaker wasn't in a WrestleMania match until WrestleMania VII (7).
wwe's undertaker comes back to smackdown every year a few weeks before wrestlemania
yeah. he is going to leave wwe at Wrestlemania 28 with a streak 20.0