As noted earlier, The Mercury News recently reported that Santa Clara is a finalist to host WrestleMania in 2015 at the San Francisco 49ers' new stadium, which can hold 75,000 fans. Santa Clara mayor Jamie Matthews will be flying to WWE headquarters in Connecticut next week to pitch Vince McMahon. According to the article, Philadelphia is the other competing city.
Philly.com has an article about Philadelphia being a finalist to hold the event at this link. The article noted that the city that doesn't get WrestleMania in 2015 will likely host it in 2016.