Buster Olney just tweeted:
Am told that the playoff fields will expand IMMEDIATELY, for 2012. Five teams in each league, with a one-game playoff between two wildcards.
Uh, so for that to happen, the Astros would move to the American League in time for next season. Looks like Carlos Lee will get to DH, after all. More to follow...
UPDATE: Hold on. That may not be right. They could possibly make that move without moving the Astros just yet.