Well, the subject says it all : too bad the company can't present futur customers any spec sheet with weight at different configuration options of their 2 models in this web site
I'm really disappointed :(
There are features and specs for Roadster in "http://www.teslamotors.com/roadster/specs". Dimensions -tab lists dimensions including weight.
For Model S they don't exists because Model S doesn't exists yet. No actual Model S has been produced yet, what you see in those pictures and videos is basically a mockup of Model S in Mercedes platform using Roadster drivetrain.