Jeep is promising a diesel Wrangler complete with start stop function, to go on sale in a years time. Jeep says that start/stop technology is good for a 3-5% improvement in fuel economy. Chrysler also promises the use of Fiat's diesel technology, but it's unknown if that means multiple diesel vehicles and the time lines for those engines.
http://killwithfire.blogspot.com/2009/11/chrysler-has-5-year-plan-but-will-it.html
http://killwithfire.blogspot.com/2009/11/chrysler-has-5-year-plan-but-will-it.html