According to theBookseller.com, Last Chance To See is to be re-issued in June 2009 with a new introduction by Richard Dawkins.

The imprint acquired UK and Commonwealth rights in the book from agent Ed Victor. A paperback edition will be published in June 2009, featuring a new introduction from Richard Dawkins.
[...]
Stephen Fry and Carwadine are to present the BBC2 series, which follows up on the species 20 years on and will feature audio recordings of Adams’ voice. HarperCollins are publishing the tie-in.
The article does say "this autumn's BBC2 series", but I'm fairly sure it's going to be autumn 2009. Autumn 2008's highly anticipated Stephen Fry documentary series is going to be "Stephen Fry - In America" which begins on BBC1, 9pm on October 12th in the "New World".