The PNG government is still pursuing some kind of significant "in" into the NRL with the latest effort being talk of them buying in to either the Brisbane Broncos or North Queensland Cowboys.
If this were to come to fruition, it would be likely we'd see a few of their nationals introduced to the NRL. If they were good enough of course - I suppose a buy in to one of these teams would allow the PNG players greater development along with a better chance to showcase their talents.
Of course their play is to get a team in to the NRL one day, however there's no way in the world we'll see it til the end of the decade, atleast.