CBR has provided us with our first look at two spectacular variants for the forthcoming Uncanny X-Men #600, which serves as the conclusion of Brian Michael Bendis' X-Men run. The two newly-revealed covers below harken back to eras of mutants past: Adam Hughes' is a take on the team of the '70s, with the famous 'All-New, All-Different' line up (plus Jean Grey exploding into the Phoenix), and Olivier Coipel's pulls elements from the 1980's, such as the X-Men's time in Australia. Are you planning on picking one of these up when the issue is finally released this October?