Dishong, Higashi, and the crack a book HQ have been completely overhauled and are essentially new experiences.
Shamway (T5), the large apartments (T5), and the JBB skyscraper (T4) also underwent some updates but not as significant as the other 3.
Keep in mind T5s take an absorbent amount of time to create. There will be more in the future but the teams main focus was to make sure there was enough variety in all of the new tile districts.
Edit: And....we are not done yet lol. More will keep being added up until stable since New POIs will not break existing saves.