Sign ups are now open to the public. As far as I can tell, this is only to register an account. You are able to make an Autobot and Decepticon, but as far customization goes, that's the only feature available at this time. The sign ups were slow and showing errors but now it should be fine. EDIT: If your verification e-mail won't send right away, wait about an hour and a half. It should come within an hour.