i think sub 4 should probably be on land so they try something new and that sub will be a serius of planet exploring but i hope they wait with sub 3 until 2034 with full development since i want sub 2 to be as good as the original since they didnt hurry with it
I think they maybe should include a mob that would keep the subnautica feeling like something that looks like a cave crawler but crawls on the walls in tight canyions and has a weird giggling sound like the biters other version in the blood kelp zone and would jump on you if you came to close wile also moving slowly towards you if you werent moving and often in groups.
I think they maybe should have a motorcycle like in below zero but with drill arms in the sub 4 on land version
an emp wave of sparks that covers the whole motorcycle and you but would crush your motorcycle power and damage your character and enemies since it covers the whole motorcycle would be a cool upgrade for the vehicle
Just mentioning it would work better as a biome rather than a full game