I'm also having the same log-in issue where I cannot pass the world/channel select and get disconnected right after. I'm not even sure if I'm actually suppose to be one of the players affected by the Fredrik/potentials/crit% etc... I just know that I cannot log-in so I can only assume that I am affected by that issue.
Can't wait to play! I guess I will read some of these posts on this forum while waiting. So far, it seems like everyone that is posting here is either very upset or very supportive.