They'll probably be different seats - which is a bummer for those with screens they would like to remove.
I think this because Toyota already has 200s in other regions without the screens and there is no cover, they are different seats.
So if they're already offering the screens as optional with different seats in other regions - they are likely just to do that here in the US too.
Ref this thread of a 200 edition from Russia-
Land Cruiser 200 Executive Black Edition
That might be the case. It is possible that the Land Cruisers without the rear screens don't have the wiring harness in the seats for those screens.