Jason has been saying how he never intended to touch Ghostbusters, always doing his own thing. But now he's feeling it, and they have an idea that they feel work (him and whoever he's been writing with), so sounds like it's a somewhat recent take, at least with him. Though I know it's been pitched before.
I just listened to his recent podcast with Kevin Smith, pre-Ghostbusters announcement, but a good listen. Makes me root for him, and he has enough experience under his belt that I think it's a solid choice to give him the keys to the car.