should be a small and rather linear tutorial, introducing players to the combat system (get to check out melee with different weapons and magic), taming, ressource gathering and basic crafting. There should be no incentive to stay there after youve grasped the basics.
It should also tell you as soon as you spawn in, that this is the tutorial of the game and that you need to move to the main game to progress beyond the very basics.
Im not opposed to a time limit, but it could feel bad to some new players.
I also think you should not be able to farm a bank full of basic ressources there and get them transfered to your bank in the main game.
But it will probably just be a copy of MO1 Haven.