AudioGO have announced Babblesphere, which is the 4th installment in the original Destiny Of The Doctor series which has been commissioned to celebrate Doctor Who's 50th Anniversary.

The full press release can be seen below:

The violent, volcanic world of Hephastos is home to a colony of composers, painters, authors and poets, all striving to create the greatest works of art the universe has ever seen. But in pursuit of their goal, artistic collaboration has been taken a stage too far... 

When the Doctor and Romana arrive, they discover the colonists have neglected their well-being and their once beautiful habitat has now succumbed to decay. What's more, they are enslaved to the Babble network which occupies their every waking moment. Every thought, however trivial or insignificant, is shared with everyone else and privacy is now a crime.
The colonists are being killed and the Doctor and Romana begin to suspect that a malevolent intelligence is at work... 

Doctor Who: Babblesphere (Destiny of the Doctor 4) is an original adventure by Jonathan Morris, a prolific writer of Doctor Who fiction, and is available as a CD or download.  It’s performed by Lalla Ward, who played Romana in the original TV series, and Roger Parrott. The series is produced for AudioGO by Big Finish Productions.

Doctor Who: Babblesphere is set to be released on Monday and will be available as download or CD for an RRP of £10.20.