Latest update:

GameStar received official word from JoWooD. Their answer is of course quite tricky, as always. It would be nice if one of our German readers could make a precise translation of the JoWooD quote.

I understand it the following way:
JoWooD currently has the exclusive right to make games with the name Gothic.
G3: JoWooD has all rights, incl. console ports.
G3A: No Comment!
G4: JoWooD has all rights, incl console ports. Another dev will make the game.
G4A: PB has ROFO. JoWooD everything else.
G5: PB "may have certain rights" but JoWooD has "at least" ROFO & ROLR for worldwide publishing.

Note: The specific rights (ROFO and ROLR) were not defined in the statement and the exact terms different. It is possible JoWooD means something else.

edit: ROLR, not ROFR. Doesn´t really make much of a difference here. It basically means JoWooD can take over the finished deal PB negotiated with somebody else.