With my experience with DJI products (since the original Phantom) All the potential upgrades will be interesting to see.... but I forecast different batteries and chargers, filters and any accessory to be different, that way you cannot simply use any of your old equipment.
This is one of my pet peeves about DJI, NOTHING is backwards or sideways compatible. It is a completely different product every time. Only recently (Mini and
Air 2's) has this been possible. I was pretty pissed when the
MP2 came out and I had to dump FIVE of my MP batteries, multiple chargers, along with the lens filters etc.