Large open maps worked well when you could cover all engagement ranges with disk+grenade launcher+chaingun. Take away two of them. Now how do you kill someone?
Skiing? The video didn't show any. Probably not implemented yet.
Jetpacking? Not very far, or pistols and shotguns would be completely pointless.
Mix of classes? Heavy is going to need some _serious_ affirmative action to make up for being a fat piece of shit with no disk jumping (because he took mortar instead because otherwise why would you pick heavy).
As for health regen and medics... Are you sure we are talking about the same Tribes? They'll have to slow the fuck out of this game for healing to become viable.