New Trailer Episide 8 "The Last Jedi" [MERGE]

Does anyone have a good guess at where the place is at the 10 second mark? Looks like inside a volcano. Now is it possible Kylo Ren is visiting the Sith Temple on Mustafar that once was there and where Darth Vader's castle sits? Would be a cool ending for Episode 8 to have him find Sith Holocrons and other ancient Sith artifacts.