Of course the topic is fascinating but I am rather disappointed in the programme so far, partly because it seems to be more about Stephen Fry than language. It seemed bizarre that the accents of the UK were imitated by Stephen Fry rather than authentic examples being given.
However, perhaps the programme will encourage more people to be interested in language and Fry does seem to have the right instincts in terms of preservation of languages.
http://www.bbc.co.uk/iplayer/episode/b015qqkl/Frys_Planet_Word_Identity/