Miss Portia posted this over in the preview forums, which has to do with the slow acceptance rate
[quote user="Miss Portia"]
Due to a tremendous response from our fans, the Xbox Preview program has reached a near capacity level. With that in mind, we are slowing the number of new people we are accepting to optimize for testing. We are thankful for the amount of interest we’ve
received to date and look forward to sharing more details on preview opportunities soon.
Did this solve your problem?
Sorry this didn't help.
Great! Thanks for marking this as the answer.
How satisfied are you with this reply?
Thanks for your feedback, it helps us improve the site.