I think they have a new version of OcuSynch, so that could be an option.I'd be curious to see what they change for the Mini 3, because I absolutely love my Mini 2. It's honestly hard for me to think of ways to make it better.
I *think* they first released the Air2 with OcuSynch's last version, and then the Mini line got it with the Mini 2, so now that they've put the new pro drones out, we might see some of the good sauce trickle down to the Mini family.
Other than that, I would take a guess that maybe some of those obstacle avoidance sensors?
I don't know a lot about drones so this is all just guesswork!