Command massive armies of tough space marines or nightmarish cyborgs in endless battles across the Strogg home planet.
The animations of the heavy hover tank have been slightly improved (their behaviour when aiming and shooting especially) ahead of the Version 4 release
I'm not seeing why since some have hover propulsion and others have tank treads.
when they go in, it lowers their damage zone slightly, so there is a very tiny benefit, in ranged combat. I think it's okay for the player to be able to do it, but enemy-controlled forces won't do it.