Edit: Apparently, Boubouille was mistaken. I can’t imagine that this was an April Fool’s Day joke as it isn’t funny, so I think we have to assume it was a case of unfortunate misinformation.
Boubouille of MMO Champion is reporting that the 4-piece set bonus that grants an additional 15% speed bonus while in Travel, Cat, and Bear Forms has been restored to the [Gladiator's Refuge] (Arena epics) and added to the [Kodohide Battlegear] set (reputation-purchasable set). If true, this is great news for Restoration-based PvP and probably points to a much greater decrease in 2v2/3v3 performance by Druids than Blizzard was anticipating or intending.
Perhaps less fortunately, the Balance Wyrmhide sets have had their set bonus reverted to the speed increase, as well. I say “less fortunately” because many Boomkin were excited for the recent change to a more offensively-based set bonus. Sorry, guys!