They may have been quietly progressing a group of episodes or serials through the "Preparing for Release" process for the last year alreadyI wonder what the release schedule would be like should there really be a large number of shows. Are the restoration team even capable of tackling that much work in a reasonable time ?
Honestly, even if an official announcement that all (or any) of these 90 episodes were found were made today, the soonest you should expect any potential DVD release would be 2014. In my uninformed opinion, or course.
If films are in the possession of the BFI under condition of first screening then the BBC would have to wait...