There might not appear to be much to indicate cosmetic changes to the site on the plans, but I have heard rumours that Nemesis will in fact be lightly rethemed to an IP, in order to add commercial appeal of this refurbishment. Having been impressed with Disney's collaboration with Aerosmith on Rock N'Rollercoaster, Nick Varney is in talks to involve Metallica in the new version of the coaster. The current backstory and soundtrack will be reworked to incorporate their classic, universal hit, 'Enter Sandman'.
Of course, this is just a whisper from the hotel gift shop right now, so take it with a pinch of salt/grain of sand.