Of course you'll be able to avoid this by simply entering only Islands of Adventure and walking back to the Wizarding World, but then there's no Hogwarts Express for you!
Next, the newest big attraction ride is "Harry Potter and the Escape from Gringotts." It's essentially a mine ride, as cars of riders will descend into the caverns of the wizarding bank under the pretense of visiting their vault. Of course Voldemort can't let this happen, and, much like with Disney's Indiana Jones ride at Disneyland, the riders will be "cursed" and sent on a chaotic journey through the bowels and dark corners of the building. For a rendering of what the ride's actual cars will look like check out Theme Park Insider.
Aside from these two major additions, the park will also receive the entirely new London Embankment district, which will be home to King's Cross station and the terminus of the Hogwarts Express train. As if visiting a Scottish fantasy town (Hogsmeade) in the middle of an Orlando summer wasn't weird enough, Universal Studios visitors will also soon find themselves in the midst of a bit of London before heading down Diagon Alley and into the Gringotts Bank ride.
See you there, whenever it opens?
[Rendering: Universal Studios]