Script for 'Ghostbusters 3' in the works
"The new story combines the original characters with new ones, including Sigourney’s kid with Bill Murray, Oscar," writes Roger Friedman on his Showbiz 411 blog. Friedman recently had lunch with Reitman.
The plot itself has been in flux for a while. It had been reported that all Dan Aykroyd, Harold Ramis and Murray have agreed in principle to return for the movie, though they wouldn't necessarily be the main stars. Sigourney Weaver has said she won't return. No word on Rick Moranis, Annie Potts and Ernie Hudson.
In case you're curious who played baby Oscar in Ghostbusters II in 1989, it was both William T. Deutschendorf and Henry J. Deutschendorf II. And it was the only screen credit for either "actor."