I reckon Porsche is still a priority for PD and that they may be in talks with EA over licensing. If PD had given up on Porsche, we would would have started seeing premium RUFs by now.
If anyone is to blame for our Porsche related misery, it's Porsche itself. If I remember correctly, EA - Porsche deal has been renewed numerous times; why on earth would Porsche lock itself with EA! scratch that, the question I should be asking is why would a company like EA offer Porsche with a deal so sweet that it's willing to give up the licensing rights. The whole situation has crazy written all over it.
Anyway, one can always dream of an awesome GT6 - hopefully the PS4 would have a GPU that's, at least, on par with the 7850. High res shadows, photo mode shaders and textures in game play, 24 cars on track, livery editor and all the original tracks.