This is what FindmyPast have said, and I assume it will apply to Ancestry and all other sites.
The General Register Office was part of the Office of National Statistics, but has recently become part of the Passport Office. Owing to the view that the Passport Office takes on this information, it has been decided that it should no longer be made public in such a manner. No further BMD indexes for any date after 2006 will be added to the website as a result of this.
Stan