They'll rarely reissue a line that was very popular. I only know of two specifically -- Amy Butler's Gypsy Caravan was reissued, as was 3 Sisters Paris Flea Market. I also had the impression that one of Denyse Schmidt's lines was reissued, but can't recall the name of that one.
Iceblossom, thanks for that information on the Missing Fabrics website. Cool idea.