From www.wdwinfo.com

Universal Orlando releases video of Gringotts Bank's goblins
May 8, 2014

This summer, Universal Orlando will open the Diagon Alley expansion of the Wizarding World of Harry Potter. The new area is currently under construction at Universal Studios; the existing land is located next door at Islands of Adventure. The Hogwarts Express train will connect the two. One of the most talked-about attractions is Harry Potter and the Escape from Gringotts, a steel roller coaster that uses 3D technology and takes riders through the Gringotts Bank from the movies.

Universal has released a video showing the Goblins that guests will see on the ride. A specific opening date has not yet been announced.