I would agree there are no compelling quantum leap features to get the platinum. It seems like DJI would drop prices on Mavic Pro if they were trying to clear them out and get platinum sold. They probably figured out it would be easier to get users under their control by selling a new bird with new firmware.
I like the MP (more than my Spark or P3P), it flies great, video is great and I'm leaving it at version 700 until I see a real good reason to update. If the P3 was any lesson, they introduced more bugs than they fixed in each update. Pays to wait for others to discover the bugs.
I think DJI introduced a lot of models on Phantom trying to cover every price point / level. Maybe they are trying that with the Mavic, but it should have had an upgrade to the camera. They are due for a larger CCD sensor to improve image quality. There is no denying, however, they dominate the drone market.