Maury Brown has a story up on his website, discussing how Bud Selig says that today is a "hard and fast deadline" for Tom Hicks to decide who the buyer for the Rangers is going to be.
I'm not entirely sure what, if anything, Bud can or would do if Hicks doesn't act by today, but I guess Selig could say, MLB has decided that group X is going to be the buyer, and try to strip Hicks of any decision-making powers whatsoever in this regard.