Here's a Chronicle report referencing a Peter Gammons tweet saying that Jim Crane is expected to be approved as owner of the Astros, with the condition that the Astros will then move to the American League.
Gammons followed that tweet up with a very telling tweet that read, "TGHSAW$!%FFFFFF"
More as it develops, I'm sure.
UPDATE: Not so fast my friends. This new report from the Chronicle, entirely free of Peter Gammons tweets, says that Crane has not been contacted about a move to the AL.