Aoki was posted by the Tokyo Swallows today.
MLB teams will be able to submit bids as soon as it is officially announced that Aoki is available through the posting system.
A four-day window will then follow in which teams can submit their bids. If no bids are submitted during that time, then Aoki will again be playing for the Tokyo Swallows in 2012.
However, it is highly likely that at least a few teams will bid on Aoki. And the team has not indicated that it will reject the top bid if it is too low.