ok, so this is just according to a guy from the steel cage podcast, but he seems to be right a lot of the time. he says the current plan is as follows:
undertaker vs lesnar
punk vs orton © for WWE title
hhh vs bryan
cena © vs bray wyatt for the WHC
ryback vs goldberg
Wtf is this, potential Wrestlemania?
Wrestlemania 30's potential line up changes more often than I have coffee... and I drink a lot of coffee, I'm on my 6th large cup and it's just gone 1 in the morning and I'll still sleep like a baby.
The rumour about Taker v Brock has been mulling around for a while, but so has Taker v Sting, we'll know for sure come January when Sting's contract is up with TNA and also the Rumble week is usually when in-ring Taker makes the choice (if he's personally not already).
The other possible main event which has been mooted around due to the sheer scale of an anniversary this Wrestlemania will be, would be a bold step for WWE to take and make it a Fatal 4 way with Cena, Orton, Punk and Bryan for the WWE title. The WHC could well involve Big E and Sandow, who are both tipped to be big names going forward and the WHC for me should be joint top billing, but when the Big Gold Belt was WCW's thing it will always be treated as second class by WWE, however it is rumored that WWE may well be using the WHC as the testbed for WWE Title holders.
Other possibles are:
Cody v Goldie
Jericho v Bray Wyatt
The Wyatts and Kane v The Shield
Other folk that have been making waves and may be added to the bill in some form may be Cesaro... finally, Ziggler and RVD. There is also talk that Sami Zayn may also get a nod for Wrestlemania as well as other NXT guys and gals.
But the more interesting matchup is the possible Street Fight match between Vince and Trips... yeah, I've read that may well happen.