Sorry for double post but SuperBot just posted this on their FaceBook:
"For the limited beta set to begin 11 September, people who are able to participate will have gotten an email already. If you did not get one, you were not selected to participate. With that said, this is a limited beta for specific testing purposes and subject to date changes. This latest phase has been postponed for a week. Sorry about any confusion and/or inconvenience."
Way I see it that means if you haven't got an email yet you won't be getting one and if you have got one then you still have to wait a week before you can play it. Shame it took them so long to tell us.