According to PWInsider, coming out of WWE Fastlane last night, it was said backstage that Daniel Bryan will be facing either Dolph Ziggler or Sheamus at WrestleMania 31.
Dolph Ziggler tweeted the following today:
https://twitter.com/HEELZiggler/status/569910560671850496
HOUR LONG IRON MAN MATCH PLZ
Not Sheamus pleeeeaaaaseeee!