Several raid buffs have had their ranges increased to 100 yards, up from 45 yards, to prevent select buffs from repeatedly getting applied and removed during highly mobile encounters. Some buffs, such as paladin auras, totems, shouts and Blood Pact are intentionally meant to have shorter ranges and remain unchanged.
At this time Blizzard has not posted a full list of the raid buffs that have had their range increased, but, as they said, the list is fresh and still incomplete. This also comes at a time where many class specific aura buffs (like Unleashed Rage, Abomination's Might, and Elemental Oath) are being changed to passive auras not requiring an outside trigger such as a critical strike or a spell cast to activate.
Be sure to watch for class-specific updates detailing further changes, and we will keep you up to date with information as more becomes available.