I wish I had more faith, but if indeed the speculation
is true and Hasbro is planning on offering up a 500th Vader, well, Hasbro's repack-o-mania leads me to believe that some "new" variation of this is what we'll get:
Take the old Complete Galaxy Chamber, toss in a "new" kit bashed Vader (vOTC body with Rem Helmet Head maybe?) and there's your 500th "special".
Hasbro has given me NO reason lately to expect something new that isn't tied directly to Ep3, so until I see otherwise, I'm gonna have to go ahead and expect the worst from them...