If they indeed have inside information, it looks like we won't be getting a 32GB standard iPhone 5 but maybe an 8GB too?
Take a look here.
http://9to5mac.com/2012/09/10/t-mobile-uk-internal-and-external-systems-now-have-placeholders-for-4-different-iphone-x-sizes/
Take a look here.
http://9to5mac.com/2012/09/10/t-mobile-uk-internal-and-external-systems-now-have-placeholders-for-4-different-iphone-x-sizes/