Halloween skins will become available when Patch 4.3 hits the live server on PC. The skins will presumably become available on console during the next live server update, which is expected early October.
The costume sets that will be available in the store for a limited time are the Pirate Captain and Swashbuckler costumes, the Kansas and Scarecrow sets, and finally her Royale highness, The Skeleton Queen.
Each set will be sold in individual pieces or as a set at a spooktacular 33% off! They have also included The Leo costume that can be purchased using your coveted BP.
Suit up into something scary and haunt your foes on the Battlegrounds this Halloween!