skeletonbow: They've never said anything about bringing Postal 3 here, and I'm pretty sure GOG would turn it down anyway considering it is a horrible flop that even RWS straight up tells people "do not buy Postal 3" on their own website, and even has multiple jokes about Postal 3 inside the newer Postal 2 content. For example, in Postal 2 you can find a copy of Postal 3 in a garbage dump or something like that, and if you pee on it something funny happens, I forget the details but you could find it with Google I imagine. It's a little "Postal 3 sucks" easter egg.
So yeah, don't expect Postal 3 to show up here. :) A friend had it and I tried it once and it is genuinely terrible.
RWS doesn't have a say on whether the game could come here or not (at least, not for the time being), as development/publishing is handled by Akella. In fact, one of the reasons that RWS have disowned the game, is because Akella wouldn't let them fix it.
As for GOG definitely rejecting it, I'm not so sure about that. "But Grargar, it's a terrible game!" Sure, but so are
Earthworm Jim 3D,
Kingdom: The Far Reaches, the once-present, but now-removed Simon the Sorcerer 4 and other examples.
I believe that If Akella requested that the game be released here in exchange for, say, further installments in the Sea Dogs series, GOG would bite the bullet and release Postal 3, leading to the usual complaint-filled threads about curation and rejection.