There is a Making of Featurette with Harold Ramis chatting on for a little over 6 minutes about Ghost Busters 3 and what we can expect.
He is looking forward to a first draft and should this hold enough potential, he will be off and running with the continued franchise.
CinemaBlend quotes Ramis on the idea of doing this “just for the paycheque”
You could reap the reward, we could do anything, and we’d all make some money probably. But no one wants to do that. We don’t need the work, we don’t need to do it. The public, if they only had two Ghostbusters, we’d all be fine. But if we’re gonna do it, it’s impossible to say we want to be better than the first one, but who knows?”
So it sounds more to me that this isn’t a done deal, but it is certainly on the radar. The ball is rolling, but will it get to the end of its path?