This is what I have heard from three separate people on this site including the sock.
One person explained that the AD and boosters wanted Bo gone, but wanted to have their ducks in a row with a replacement before they made it public knowledge, so they've kept it under wraps as much as possible from EVERYONE, because if they cant find a candidate they will keep Bo and want him happy. Sounds elementary in explaining it with those particular words, but also matches up with a lot of people explaining that they haven't heard a peep when they usually would.
Another person told me that there was a meeting on Monday and it was decided that Bo is out, and cited Harbaugh and Tressel as the top two candidates.
Then, the sock puppet said the same thing, and the other said they aren't the sock puppet.
This is mostly worthless but it's discussion.