This from slashfilm.com:
"A video has appeared on YouTube showing the Ghostbusters 2 effects team and Robin Navlyt (who wore the Slimer suit in the film) testing out the Slimer wearable puppet’s ability to emote."
Say what you will about the progress of "Ghostbusters 3", or even if it will get off the ground and finally receive that ever elusive green light. If you don't like Slimer then you probably like to take it in the brown eye. Slimer is iconic.