The wikipedia page for the Roadster says:
Is this still in Tesla's long term plans? Is there to be a new generation of the Roadster?Tesla stopped taking orders for the Roadster in the U.S. market in August 2011.[SUP][27][/SUP][SUP][28][/SUP] The next generation is expected to be introduced by 2018 and will not be based on the Lotus gliders but instead on a shortened version of the architecture developed for the Tesla Model S