At the premiere of Fantastic Mr Fox, in which he voices a badger, Bill Murray “exclusively spills the beans on Ghostbusters 3” – yeah, you and everyone else has the exclusive scoop. And how unsurprising that they all conflict.
Basically, Bill confirms he hasn’t seen a script, he is not committed to doing it until he’s seen a script and is confident that it’s really good. He goes on to say that there is no script, just “a wish-list for someone”, but this just seems to be Bill not being in the know, as Reitman, Aykroyd, and Ramis have all confirmed a script. Alternately, Murray may just be speaking in terms of a green-lit script. Meaning, “there’s no script” equals “a script hasn’t been approved.”
It’s a bit of a step back from all the “Everyone is on-board” talk recently, and it confirms that Bill remains the hardest sell for a third movie.