As I've only been into MAC for the last 3 years, I'd love to see a repromote of Creme de Miel, Magic Dust, Waternymph, Meadowland, Chill (the most perfect matte white I've ever come across) Bold as Gold & Manila Paper (both as singles, not part of quad as I never buy quads since there's only 1 color I want & I can't justify the price for 3 more I won't use), Gold Dusk pigment in OJ (have the small vials, but the pigment color in the vials are always different, more muted, than those issued in jars). I also hope they reissue I Get No Kick e/l (completely missed out on) & Sin-tillation lipgelee as stupid me didn't pick up a backup before it sold out.
What I would absolutely love to see is a lavender mineralized blush just like Love Rock or Moon River. I thought that the Quite Cute blush was gonna be it, only to find that it was powdery, blended away & had that awful red heart in the middle that you couldn't get around with your brush.
And would also love to see the 131 stippling fiber blush brush made in a full-size face brush. Enkore & Sigma among others sell these, but the white stippling fibers are synthetic & not silk like on MAC's brushes.