i was surfing around today looking for info on GB3, and came across this: http://www.corona.bc.ca/films/details/ghostbusters3.html
i found it very interesting. if you scroll down to the bottom, it says something about Men in Black 2, and how it is not comming out and is the same reason why GB3 is not comming out. well, as most of us know, there IS going to be a Men in Black 2. that could mean that there could be a GB3.