Source: The Wrestling Observer
WWE reportedly wants The Undertaker to be inducted into the 2015 WWE Hall Of Fame, if he chooses not to wrestle at the WrestleMania 31 event that weekend.
As noted in the past, if ‘Taker does decide to work a match at WrestleMania, WWE officials want it to be with Bray Wyatt. They are keeping him strong due to this.
A potential Hall of Fame induction if he doesn’t wrestle, guaranteeing him as part of “WrestleMania weekend” either way, is likely the reason WWE has been advertising The Undertaker in the WrestleMania promotional materials, such as the tour buses and production trucks.