Yes, the move took place last night (checked it out today) - from the Port website:

"US Airways has moved its ticket counter from the south end of the Main Terminal to the far north end, next to the United Airlines counter. US Airways flights now depart from the North Satellite and the airline uses Carousel 15 at the far north end of Baggage Claim."
http://www.portseattle.org/seatac/tr...default.htm#us