Blizzard also announced a boxed Collector's Edition for World of Warcraft to ring in the game's 15th anniversary. It includes a Onyxia pin, map of Azeroth mouse pad, art prints, special anniversary mounts, and a large black-and-gold statue of Ragnaros the Firelord. It will release on October 8 for $100, and you can pre-purchase from the Blizzard store.
Each battle that you win will yield experience for each pet that participated. However, deceased companions will not receive any experience (so make an effort to keep them alive by swaping in a different pet). Experience gains are based on your pet's level compared to the wild pet. Defeating a higher level opponent will grant more experience than a much lower level one, but be ready for a tough fight!