Blizzard has trademarked something called Heroes of the Storm.

The trademark was filed in New Zealand by AJ Park, an intellectual property firm that had a hand in registering Hearthstone as well as Diablo III expansion Reaper of Souls.

Despite its similarity to Hearthstone’s subtitle Heroes of Warcraft, Heroes of the Storm is unlikely to be an expansion for that game: the trademark covers game discs as well as software downloads, and Hearthstone is download-only.

Blizzard All-Stars, the MOBA formerly known as Blizzard DOTA, is a safer bet, and the vagueness of the name would allow the company to bring in characters from its StarCraft, Warcraft, and Diablo universes.

Alternatively, it could be the next expansion for World of Warcraft.