Ghostbusters 3: there will be new Ghostbusters alongside old ones

Ramis promised that all the old core players will take part in the updated version, including Bill Murray (Dr. Peter Venkman) and Dan Aykroyd (Dr. Raymond Stantz), who co-wrote the original films. "We're all going to be in it in different kinds of roles," Ramis said. "We're going to be the sage mentors. There are going to be young Ghostbusters."

http://www.mtv.com/movies/news/articles/1607995/story.jhtml