I would think Palm is staying, but who knows, right?
Also- remember that Hard Rock doesn't aim for the conference crowd- Sapphire, Royal Pacific Portofino and now Aventura moreso do. And they love dressing up and taking a boat to Citywalk for dinner.
Emerils was the 100% prime location in citywalk- nothing was really better outside of maybe NBC sports Grill.
It is also one of, if not the, only stand-alone restaurant building there (everything else has shared walls). Not to mention the floor to ceiling walls. It'll be interesting to see if they go truly high end or moderate. Considering Vivo isn't high-end but moderate, that might be the lean; or, they feel they need a high end presence. I think either would be very successful.