The
oneworld web site now lists AS elite lounge access. Completely unsurprisingly, it is a verbatim copy of the AA policy:
Alaska Airlines Mileage Plan MVP Gold and MVP Gold 75K members are not eligible for access to oneworld member airline lounges when travelling solely on North American flights within or between the U.S., Canada, Mexico (except Mexico City), the Bahamas, Bermuda and the Caribbean. For more information, visit Alaska Airlines' website.
I couldn’t immediately find the exceptions itemized in the AS web site. This does allow lounge access on MEX and Costa Rica itineraries (like AA normally does), which I’m mildly surprised by. It does not include the AA temporary exception to the exceptions, allowing lounge access on all international itineraries.
The AS lounge access on paid first class flights remains but is specifically outside the oneworld policy, so no class of service based access to partner oneworld lounges on domestic/short haul itineraries even when flying paid J.