@ ShadowMoses: Yes, I believe the engine for the first two games was theirs as well.
I agree with HiddenX. The game world in Gothic was tiny by modern comparisons, yet I never once, and even today, do not feel that the game is cramped. I think developers should stop leaning on the "We've got the biggest game world" crutch, and start making solid games that don't make you notice that your avatar has only walked 2 miles instead of 10.
If PB didn't make any money from G3 as it sounds, then I doubt they will be around to make any more games - they won't be able to afford it. They will probably dissolve the group and all go get jobs at other studios. Then about 2 -3 years from now a game will come out with some sort of name and characteristics that makes us wonder if it was intended to be the sequel, kind of like Arx - DMofMM.