Update, 5:43pm: Susan Slusser reports that Trevor Cahill will go on the 15-day DL with LEFT shoulder soreness.
UPDATE, 5:17PM: Susan Slusser reports "Jack Cust designated for assignment it very much appears." Wow.
Update, 5:04pm: Landon Powell sent down. This would imply Jake Fox gets a spot because the A's need a backup catcher.
Updating, as of 4:57pm: No official announcement of the 25-man roster yet but:
According to Susan Slusser and Jane Lee: Travis Buck, Tyson Ross, Gio Gonzalez , presumably joining:
Jack Cust (?)
Andrew Bailey says his knee locked up on him but he will ready on Opening Day.
Coco Crisp (fractured his pinky in yesterday's game), Joey Devine, Josh Outman, and Michael Wuertz will start the season on the DL.