The WCC's were a rare opportunity to get a lot of PJ sessions that were largely unavailable in cd form at the time (as you have already pointed out); a Conn series of the West, if you will. But you see how quickly those disappeared, and that's what I believe was the beginning of the demise of the PJ material, sans the remastered Baker disks that came out a while back. Otherwise, don't hold your breath for any substantial material in the near future (sans the Gil Evans set that came out last year in the conn series and the Booker that came out earlier than that, but notice that these discs carry the BN label and not Pacific Jazz label too; a sign of their unmarketable appeal).
PS: Picture of Heath was not a WCC, but a reissue of The Playboys, which already saw cd issue. POH, had a new photo of the band that replaced the racey photo of a model covering her breasts with two hand-puppets; perhaps the reason for the new cd reissue, which apparrently is going OOP too.