We're assuming that the new planet will operate in a completely different way, I'm assuming the opposite.
The overall system (provided we can actually move between planets) will have to be interopable, an existing weapon will work in exactly the same way on any other planet as it does on Calypso. We'll probably just end up getting any new things renamed with slightly altered graphics, new mobs with a slightly different environment.
If any avatar changes were requested or possible on the new planet then it will have to be global across the whole of
EU, unless we have to change loader when we travel to them. If it won't be possible for some things to be transported between planets then it could end up be a dissentive to travel between them. Who will want to get fully kitted out leaving a planet only to find themselves naked on the down ramp from a spaceship because none of their stuff is allowed.