Its now confirmed, now that they have pussified the Grand Cherokee into a soccermom worthy crossover...it gets a diesel. Which may hint at the option in a wrangler...
http://www.autoblog.com/2013/01/14/2014-jeep-grand-cherokee-gets-surprisingly-comprehensive-update/

http://www.autoblog.com/2013/01/14/2014-jeep-grand-cherokee-gets-surprisingly-comprehensive-update/
