Additional patch 3.1 changes:

• The rewards for "Glory of the raider" (normal and heroic) will be removed, to make the mount rewards more uncommon.
• New 310% mounts rewards will be giving the achievements in Ulduar.
•  Throughout the weekend testing will be made on PTR on the first 5 bosses of Ulduar. You can already read about Hodirs ability and tactics on the Hodir for dummies strategy guide page.