And back to the original question, everything gets wiped except:
• your avatar/customizations/owned clothes
• your credits balance
• your name
• your profile (anything you've filled out)
• your friends list
• a few custom/special items (yeti and bunny, so far)
On the other hand, the Encyclopedia, Forums, and Groups are somewhat different from the things associated with an individual account. The list only contains things that are unique to an account.
Groups are going to be changed pretty radically during beta. What you see as groups right now will not be wiped. But some other stuff, which we have not yet added, might be wiped :)