Fantasy Flight Games are reporting that copies of the BattleLore: Horrific Horde expansion are now available for purchase from FFG and from your local game store.
From their website:
Fantasy Flight Games is proud to announce a major release that will have Goblinoid commanders across the realm screeching with delight. BattleLore: Horrific Horde Goblin Army Pack, the newest expansion set for BattleLore is now available at your friendly local game store as well as our webstore.
In addition, the rulebook (PDF, 1.1 MB) for Horrific Horde is now available on the BattleLore support page.