I noticed in the armory all guilds last did Anub'Rekhan, which is not the last boss of Naxx, does the current content stop there, or are guilds progressing past that ? I am not sure how accurate the armory is or if the dates shown was the last time they did it or the first time they downed that boss.
Edit, wait i goofed. The list is sorted alphabeticaly and Anub Reka'h is a boss in naxx. If you change the boss in the list you'll see they've done Kel and Saphron loads as well