rumors have been going around that WWE wants a host for WM 30 like Rock was for WM 27. The three rumored names for the hosting job are: The Rock, Stone Cold, and Hulk Hogan.
Many believe that it won't be Rock since he has been at the past 3 wrestlemania so it wouldn't be special. So it could most likely come down to either Austin or Hogan.
Hogan hasn't been in a WWE ring since 2007. It is unknown if Hogan has resigned with TNA or will resign. But it has been said that WWE have contacted Hogan for said the hosting Job.
Rumors have been going around that Austin could have a match, which could be another marketing tool WWE could use to help promote WM 30. Austin hosting and having one final match at WM 30.

Austin isnt having a match, sadly

For fuck's sake, don't be Hogan.

Why does it even need a host? Rock taken up half the bloody show last time

^Agreed. They don't need a host.

^ It's just for promotion reasons, if wwe can find a way to draw more money they will do it.

Did the Rock even promote Mania when he was host?

he didn't but it got media good attention, which Vince loves. Vince's goal in life to be accepted by the media

Austin and Hogan will promote WM 30 when they go on talk shows on TV and radio. However Austin will be cheaper, since he has more love for WWE. They'll have to give Hogan a huge check if he has to promote them, since Hogan has more love for Money.