Partial Source: Pwinsider.com
As of last word, both The Undertaker and Shawn Michaels were expected to be at tonight's 20th anniversary show of RAW in Houston, TX. WWE had been pushing to get both to appear, as Michaels was the Intercontinental Champion on the very first episode of RAW and The Undertaker was in the main event of that show.
The Undertaker has been rumored for a WrestleMania match with CM Punk and if he appears, we could see a tease of that feud tonight.
Ric Flair is also rumored for the show. The Rock is confirmed to appear and there is no word on Steve Austin's status as of this writing.
Keep in mind - Flair, 'Taker and Shawn Michaels are only RUMORED as appearing and nothing is set in stone.
More as we get it.