There is no way that the Buffy/Angel PF collection is going to be as expansive as the 12" line. If it took this long to get a 12" Giles, imagine how long it will be before he is rendered as a PF? Perhaps in Demon form....
Besides, I think the PFs sometimes are overrated. Sure the Darkness PF is stunning (as well as Spike... except for that blasted nameplate) but for every one of him, Sideshow releases a Dagobah Luke and Yoda PF or Frodo PF, or Gandalf the White PF. Boy... seeing "Blandalf" at SDCC didn't make him look any better.
The PFs usually turn out better when they are creatures of some sort. Human characters are a little touch and go.