Maybe something to do with Rivers?
Most likely.
The North County Times reports San Diego Chargers QB Philip Rivers (sprained left knee - questionable) was able to work for the second consecutive day Friday. Rivers, who was wearing a sleeve and brace on his knee, divided the snaps with backup QB Billy Volek. If Rivers suffers a setback, Volek would get his 11th NFL start and first with the Chargers. He's 3-7 as a starter.
Yeah, that's what I'm thinking.
I guess Vegas knows something one way or the other at this point and the news hasn't hit the wire yet.
This is all I found:(KFFL) Updating a previous item, Mike Sullivan, of the North County Times, reports San Diego Chargers QB Philip Rivers (knee) is expected to play in Week 15. Sat Dec 15 1:24:00 a.m. ET 2007
It seems like Vegas, even announcers, find out before us and we check the wires constantly.