Looks like late next year (fall) we will see the S400 Hybrid according to Mercedes-Benz 2010 timeline. Following shortly after that we will see the ML350 Hybrid. Both vehicles will be using the latest li-on battery technology unlike current hybrids. The S400 has an expected 29mpg and the ML350 has an expected 30mpg. We are very excited about the new models to our line up.