Not long after Blizzard teased Hero 28 for Overwatch on Twitter, the company revealed that the next character would be an adorable chubby cheeked hamster named Hammond (AKA Wrecking Ball). Along with the big reveal, Blizzard announced that he is available on the Public Test Realm for any PC Overwatch gamers.
Source: N4G PC Wrecking Ball Revealed as Overwatch's Next Hero