According to the official Facebook page:
What does "content creator preview" mean? Streamers/bloggers get early access?We are planning for our first preview this week of both the Brawler and our Legendary Item work on the Bullroarer Public Preview server! Expect a special content creator preview tomorrow and the public preview starting on Wednesday!
Either way, CAN'T WAIT to see how Brawler works. First new class in SEVEN years!