Regarding The Undertaker and WrestleMania 31, WWE officials reportedly want him for a 2015 Hall of Fame induction if he decides that he does not want to wrestle. WWE wants Taker to face Bray Wyatt at the big event and they've been trying to groom Wyatt for that match. 

A possible Hall of Fame induction would explain why WWE is advertising Taker for WrestleMania when they still don't know if he's wrestling or not. We noted several weeks ago that Taker had been added to new paint schemes on WWE production trucks with graphics for WrestleMania 31.