Not sure if there are any of the original colours coming back, but here's a list of the shades that came out with the original collection:
http://www.sokissandmakeup.com/mac-cosmetics-retromatte-lipstick/
It wouldn't surprise me if they brought back Moxie, since it was part of the "By Request" collection last year. As for the other colours... I remember ages ago hearing that they were thinking about bringing back Bronx.
Not that any of this matters to me. My office is so dry that I couldn't possibly wear this formula.