Bless your heart. If you'd like to keep splitting hairs, then neither park is technically expanding...they are simply restructuring, replacing, and enhancing their current entertainment offerings.
Webster's Dictionary FTW.
If they are exapnding a theme, then it's expanding. Harry Potter is expanding from IOA to USF where Jaws rides and the Amity area was. Expanding because eventually one will have to buy a two park pass to experience the entire HArry Potter stuff.
Transformers is new. Reguardless of how you feel, I look forward to it in USF. It should be a welcoming addition just as Dispicable Me was! It'll add some foot traffic between Hollywood and New York.