Director Ivan Reitman is no longer attached to direct the long-awaited Ghostbusters 3. He directed the first two films, but has decided he will let a new director take on the new sequel. The studio is currently looking for that director, but they are still hoping to get the film into production in early 2015. Reitman will stay on a a producer.
With Reitman, Bill Murray, and Harold Ramis not involved with the project, I don't think the movie should move forward. Sony Pictures should just leave well enough alone. The studio has been trying to get this movie made for years, and they've gone through a ton of scripts. The most recent one is from The Office writers Lee Eisenberg and Gene Stupnitsky.
It seems like Ghostbusters 3 is going to be made whether we like it or not. I hope it surprises me and is better than I think it will be.