More if its true; as its seeming to develop, but Hulk may of began its testings tonight.
EDIT: From Reddit user Kmac2112 from earlier. Take it with a grain of salt, of-course; but this is one of the sources.
On the roar, a lot of times on a new coaster they will use different wheels in testing. Can't recall if they are harder or softer. But that could affect the noise levels if that is the case.