The new hardware RE version still has the metal shell, but mine does not have the earthing cable between the chassis and the front USB PCB, that the others have.It is easy enough to try, but apart from the front panel the case is metal: the shiny black appearance of the case is a coating.
Edit: I have taken several apart, old ones (with loader 7.30a) to a relatively new one (bought second hand but came with loader 7.33a so must be quite new) and all have the same metal shell. I don't know if this was different in the last iteration (loader 7.34a, with 1.03.06 firmware and the new tuner with vertical rf terminals).