Yep. It started last a week ago when I booked a ticket through Expedia that includes AS7 SEA-EWR. I thought Expedia transferred the data over wrong so I called Alaska. Plus, I wanted to get a seat in row 15

Alaska said that they see it as a NW number and they recognize my elite status. Possibly an IT upgrade has already started on Alaska's side to deal with DL elites?
Note, I booked a separate ticket the next day through Delta.com that includes a Delta-coded, AS-operated flight. I got the AS confirmation code and entered it on AS.com and it also shows as Qantas even though the agent I spoke with said she sees it as Northwest.
Guess it's not truly going to matter, at least for me. By the time I take these flights in October I'll have to give them my Delta Platinum Medallion number.
GBadger - AS has never given NW elites access to premium seats. You need to buy a "Y" fare to see those seats on a seat map. Otherwise, the only way to get premium or exit row seats on AS is to call and request them.
-RM