During a Charity Live Stream during the week Clarkson and Co. Reunited over video call and part of the discussions that were had during that time was where the next episode of The Grand Tour was; and its safe to say that The Grand Tour Presents: Madagascar Special is now Finished. Clarkson confirmed this during the live stream.
It's now in the hands of Amazon who have control over when the episode is released, the release shouldn't be to long though as we've waited months for the episode to release so expect some kind of promotional material to pop up on the Amazon social channels very soon.
In other recent news Top Gear Series 29 has Resumed filming after months of production