I think it will be the
Inspire 2, my predictions are:
Duel camera, one FPV in the nose, and then the main one to allow for true duel operator.
Obstacle avoidance, possibly 360 degrees, or maybe a Phantom 4 style one and the 360 on a pro version.
Longer flight time (battery may or may not interchange with the Inspire 1, I'm thinking not.
Probably more camera options, possibly a 3rd party compatible gimble, but I'm thinking not.
Improved lightbridge.
Slightly better wind handling.
Slightly better speed.
All the smart features from the Phantom 4.
Redundant systems, like the Phantom 4.
Too early for the Phantom 5 (but not by much) and I don't think there will be any other Phantom 4 versions.
Price on Inspire ones will drop.