I'd say your chances of a Yak Face POP are highest with some kind of angle attached. Maybe in a Loot Box of some sort, an exclusive multi-pack or in the Specialty Series. That's how characters like Oola, Max Rebo and Klaatu managed to get POPitized. There are so, so many of Jabba's thugs and throwbacks that I would love to see in POP form: Tessek, Ephant Mon, Amanaman, Hermi Odle, Brock Starsher, Pote Snitkin Yak Face, Ishi Tib; just to name a few. But as previously mentioned; with new media/material just around the corner; I'd say it's a forgone conclusion that OT POPS will be relegated to the back burner for the time being.
I need a Malakili (rancor Keeper) pop. That is literally the ONLY pop figure I will buy.
Although, I am surprised they haven't done a Yak Face. I thought only Malakili hasn't gotten any love, now I know there are other characters that haven't seen the light of day yet either.