This might be a bit of a spoiler for some, so don’t read….
Bill Murray has been talking to the Daily Mail (of all papers) and this is what he said about G3
"I'll come back in Ghostbusters 3 only if I get to be a ghost, I said to them, 'I'll do it if you kill me off in the first reel'. So now they are going to have me as a ghost in the film."
Bill also said he didn’t like G2 as it was driven by spectacle! I’d always hoped that the original Ghostbusters crew would get one final shindig before passing the reins onto a younger crew (for Ghostbusters 4) but alas, this doesn’t seem the case, particularly with Venkman dying off!