Amazing Spider-Man director Marc Webb posted a picture on his Twitter account hinting that the Ravencroft Institute for the Criminally Insane will appear in the upcoming sequel. In the comics, villains go to Ravencroft to get treated by Dr. Ashley Kafka. Or at least they did until Kafka got sentenced to the Slottuillotine. Maybe with some bed rest and plenty of fluids her case of death will clear right up in time for the film.
Note that the Ravencroft directory includes a room for “voltage cells.” Does that have something to do with Electro?