Late money going hard to the over (8.5 runs)

Interesting development from Vegas and the Internet Sports Books in the last couple of hours here. On tradesports.com, the A's to win has moved from 49.5% to 50.5% likely, making the A's the very slight favorites. More significantly, the likelihood of hitting the over on the 8.5 run over/under line has moved from 51% to 56%, a truly enormous move given the lack of any new public information here recently.

Do the insiders know something that we don't here? Why is the money going so hard to the over? What does this mean for the A's chances?

In my novice sports bettor opinion, I'd say that this has to do with Verlander in some way, since he's considered the better starter. Interesting development, at least....