TryHard is spot on.
Main upgrades over the V2.1 HobbyWing hardware are
double sensor port position
higher rating fets (not necessary in offroad as the number of people using 60A escs show)
ability to use larger power wires
heatsink case.
The HobbyWing V3 is going to be a very different animal ... all I can say is watch this space as it's going to break some fresh ground when it arrives around end of quater 1 next year!! (ok ... quick teaser ... BlueTooth ...
)