It depends on where this is happening whether or not they are wild trout. If it's anywhere above Anosia then yes, some are probably wild. There's no doubt in my mind that many wild brookies use Pine Creek, but are usually up the tribs by June. As for browns, they are in the whle drainage, but PFBC just released the management plan for the drainage and Ibelieve they are correct in how they manage Pine Creek.
Just my opinion, they should manage Pine a a Brook Trout enhancement stream and protect the brookies, every trib to Pine has wild, probably heritage strain in some cases, brook trout.
As for browns, there are wild browns down as far as Waterville, the questin is are there enough to warrant protecting them. I suppose you could put C & R regs on the trout after say June 1, but you'd have to justify it somehow. In my mind I can't justify it in the case of Pine Creek.