Another way to add content without creating bloat would be a series of "revisited" articles. There have been a lot of duds in the past (both magazines and books). Rather than issuing errata to fix the stuff that's weak or that no one uses, I'd be perfectly fine seeing a rewrite of the article, either updating the feats/options in the article, or retiring the old crunch and adding entirely new content. I know I would appreciate a Minotaurs Revisited or a Runepriest Rune Feats Revisited article.