Blizzard has updated their Argent Dawn page
with some new reputation rewards that will be available in patch 1.11. For the armor rewards, it looks like we can expect another token system, but the only thing reputation seems to impact is the cost of the goodies. There are six blue items and six epic items (not sets, but assorted items available). Also, epic-quality tailoring, leatherworking, and blacksmithing patterns with high amounts of frost resistance (for Naxxramas, presumably) available at revered reputation and higher.