The new game will be released next week, and will feature most of the original cast voicing their original roles..... Bill Murray, Dan Akroyd, Harold Ramis, and Ernie Hudson. The only ones not available were Sigourney Weaver and Rick Moranis.
Akroyd and Moranis wrote the story for this game. Basically, you'll be playing a new recruit capturing ghosts alongside the original cast. It looks like it'll be hella fun.