In a recent BBC Interview Dawkins says about his new work:
"It is a history of life going backwards through evolutionary
time, in the form of a pilgrimage to the past. We human pilgrims
set off from the present, in a quest for our ancestors. As we
go back to the past, we greet other pilgrims from the present,
at a series of 39 discrete rendezvous points. After each
rendezvous, one or more of the newly arrived pilgrims has
the opportunity to tell a Tale. True to Chaucer's example,
each Tale is not about the teller but carries a more general
message for life (in Chaucer's case human life, in my case
evolutionary life). The Grasshopper's Tale is about the problem
of race, the Galapagos Finch's Tale is about rapid evolution on
islands, the Elephant Bird's Tale is about the drifting of the
continents, the Rotifer's Tale is about sex..."
http://news.bbc.co.uk/2/hi/science/nature/3935757.stm