With a captip to _yimmt, we get this link, indicating that the Astros would move to the AL before the Diamon'ba'ks.
Fox Sports Arizona's Jack Magruder writes:
The Arizona Diamondbacks have been told they will not be asked to move to the American League under the current major league realignment plan that is being discussed, according to two sources close to the situation.
So if the two teams in play to switch leagues are the Diamondbacks and Astros, and the Diamondbacks won't be asked to move, that leaves....
Arizona CEO Derrick Hall:
"They (Major League Baseball officials) know how we feel. They know we don't want to move."
Because the Astros haven't made it perfectly clear how they feel.
More from The Sources:
Sources said the move of Houston to the NL West* is a precondition in the proposed $680 million sale of the Astros from Drayton McLane to Jim Crane, which Selig said is proceeding apace.
(* - "AL West," presumably)
As this is - mainly - a family friendly blog, we won't print the words we'd like in regards to making this move a condition of the sale. But it rhymes with "Toshbarnit."