The only thing I'd call a *given* in terms of existing stuff being converted...Flying Unicorn. Alchemy Bar, Enchanted Oak Tavern, Mythos, Pyrrhock and Blizz (aka, the Dragons), and Poseidon's Fury are parts of TLC that might be incorporated. Personally, from on-site looking, everything other than Flying Unicorn is going to be tricky in terms of the terrain, the bridge and resulting geography.
IIRC, no parts of JP are being rethemed.
P.S. I still want my Vekoma motorbike Quidditch match! ;)