There's been an update to the oneworld site in the last day or two.
I saw it reported here:
http://www.flyertalk.com/forum/28683949-post586.html
It now indicates access for those transcon flights:
customers travelling in First or Business class on U.S. transcontinental flights between JFK-LAX, JFK-SFO and MIA-LAX (and vice-versa) are eligible for lounge access.
The three class aspect has been dropped.