In a previous era, I could see a separate Warner World in Orlando as a possibility (especially back when they owned Six Flags).
But now, I can't see AT&T being interested in owning theme parks given how much debt they have and how focused they are on growing HBO (which was the most important part of the AT&T-TW deal).
I do think the possibility mentioned by
@Disneyhead is the most likely scenario for a "Warner Bros World" in Orlando now as a possible smaller (50-60 acre) 4th dry gate in the south resort.
There were rumors for the 3rd dry gate being an all WB park, but then Universal seemingly shifted Nintendo to the 3rd dry gate and so any resurrection of the WB park idea would be as a 4th dry gate.
As I mentioned in the expansion thread, I think this sounds like a very reasonable possibility down the road around 2027-2030 if Universal leaves 50-60 acres open.
Possibly bring in Warner as a partner and tie the Harry Potter agreement into that to make it more of a long-term/permanent arrangement.