The job part isn't really breaking news, it was confirmed via "sources close to the program" late last week.
The interesting part, though, is this:
"According to the Orange County Register, Sarkisian said he will remain at USC through the Rose Bowl, while also recruiting coaches and players for Washington. He also said he will call plays for the Huskies next season but will hire an offensive coordinator."
So pretty much business as usual for their match-up against Penn State.
It may still be a bit of a distraction, of course, but I don't think Carroll would let Sarkisian stick around if he didn't think the assistant was committed.