The assets are already here for everyone, yes, but technically "switching one parameter value" requires to patch the game, so as they'll need to go through all the tasks to deploy a patch anyway, I assume it will include everything that is ready since the last one.Why? It's there from the beginning for all people who pre-ordered the game. They only have to enable it for all by swiching one parameter value or something like that. I wouldn't expect a patch with it since they have not enough time to make it (at least if we are talking about some more significant fixes).
It may be smaller than the previous patches, but IMO it should include more than changing a value.