There was a sizable patch to the 2.1 PTRs today, but as usual, Blizzard just updated the patch notes without specifically highlighting the differences. A few new changes have surfaced in forum strife, like the nerf to the DPS tailoring sets (though that nerf has since been rescinded), but many seem to have gone un-noticed. I used a magical tool called diff to check between the old patch notes and the new ones; here are the changes I've found. Feel free to let me know if I missed any, or if I have any false positives -- the text files got pretty messy at various points.
- Inspect distance has been increased to 30 yards (from 10 yards).
- The amount of parry rating needed to get 1% parry has been reduced by 25%.
- Many set bonuses did not work properly when combined with an item or enchantment that had the exact same effect at the exact same magnitude. That issue has been corrected on all set bonuses.
- The new battleground matchmaking system is now implemented and active. This system allows the battleground to select teams of similar equipment quality and organizational level to battle each other. For now, the system will be very forgiving about creating matchups in order to keep queue times low. However, the parameters will be adjusted as necessary when more organized teams become active in the battlegrounds.