As far as controls go, if you're using SBUS or a traditional receiver, not as much has changed as at first might appear.
There is a new "Go-home" switch mode which can be assigned to channel X3. If you previously had a method of activating go home, such as through the main flight mode switch to move between M - A - GPS/A and failsafe, then you don't need to use this. I suppose it's useful for people who couldn't add a mix to that mode switch in order to get the 4 positions out of a channel with a 2 or 3 position switch, but for anyone else it serves no purpose. Note also that if you use this X3 channel for go home you can't use it for gimbal tilt or remote gain tuning.
Next the Intelligent Operation Control now has an extra feature - POI. This will circle a point that you select at a distance you select, provided that distance is greater than 5m and less than 500m. This means there are now 4 IOC modes - Off, POI, Home Lock and Course Lock (the latter two of which have not changed). Because of this and because most people only have a two or three position switch available they offer 3 different "Control Modes", labelled 1, 2 and 3. In mode 1 you can have Off, Home Lock, Course Lock. This means you can't use POI. In mode 2 you can have Off, Course Lock, POI, which means no Home Lock and in mode 3 you can have Off, POI, Home Lock which means no Course Lock. The X2 channel is configured in the same way as previous firmware to select between whichever three you've chosen.
In short then for someone who already had a three position mode switch for flight mode and failsafe, and a three position switch for IOC, the only change is to choose a Control Mode for the IOC channel, based on deciding which IOC mode you want to live without. There are no other control changes.
All the above applies regardless of what type of receiver you're using. Personally I'm very disappointed that we can't use additional SBUS channels to control the various features AND still retain gimbal control AND remote gain adjustment. Of course there are limited physical connections on the flight controller, but with SBUS that wouldn't matter.
The POI feature does look good - you set a POI by flying over it and toggling the IOC switch, then flying at least 5m away, and not more than 500, and activating the POI mode with your IOC switch. It will then circle the point, yawing as it goes. This is pretty valuable because it's nothing something you can reasonably achieve flying it by hand.
It's a shame DJI haven't got a native English speaker on their team who could write the manual. All the information is there but it is not an easy job to decipher it because of the language.
