We were told not so long ago by the software giant that app submissions would be turned on for "Mango" late August. Well, it's now late August and Todd Brix has published an update on the Windows Phone Developer blog detailing the gradual enabling of the submission process in AppHub.
A more detailed overview of the submission process will be posted within 24 hours so we'll keep an eye out for juicy bits. Be sure to have your apps at the ready.
Source: Windows Phone Developer Blog