Re: Ghostbusters 3 is a go!
i read a while back that before signing on to do GB2, aykroyd, murray, ramis and reitman made a deal with sony/columbia that required them all to sign off on ANY new GB project before it went into production. the deal also stated that reitman had first right of refusal to direct. this was to protect columbia from going out and making GB sequels without the original creative crew, which apparently almost happened when david puttnam was the head honcho at columbia. i'm hardly "in the know", so don't take it as the gospel-- it could definitely be inaccurate info.
if all of that is correct, though, then murray HAS to sign off on the script before GB3 can go into production--whether he appears in it or not.