It appears as if the big story line plan of having Vince McMahon return to WWE TV to begin a power struggle with Stephanie and HHH for control of WWE, has been scrapped.
There had been talks months ago of the Authority storyline culminating at Wrestlemania 30, with Vince returning to WWE TV to confront Stephanie & HHH, but there's been no hint of Vince returning at all, and Stephanie is no longer being announced as one of the "owners of WWE."
It’s of course possible the power struggle storyline could take place after Wrestlemania, but it appears as of now the idea has no immediate future.
WWE Discussing Multi-Talent Matches at WrestleMania
With regards to current WrestleMania plans, there have been talks of holding both a multi-Divas championship match at the PPV, as well as a multi-tag team Tag Title Match.