Not exactly anything ground breaking or whatever. I also may incur the wrath of some as well, but I kind of hope he is retired after the next match at Mania because I'm honest to god bored to death of the guy.- While it's not official yet, the internal thought within WWE is that The Undertaker is basically retired, which explains Michelle McCool leaving to spend more time with him at home.
The Observer reports that The Undertaker is in far worse physical shape than is being let on. WWE officials aren't ruling Taker out for WrestleMania 28 in 11 months but don't expect him to work another match before then. People close to Taker have talked to him about retiring at WrestleMania 28 with his streak at 20-0.
Source: Wrestling Observer Newsletter