With the debut of the all new Dodge Charger SRT8 at the Chicago Auto Show this week, rumors are already starting to swirl about the next high-powered model to come from the Chrysler group. And the reports point to a new Jeep Grand Cherokee SRT8.The power of the new 2012 Jeep Grand Cherokee SRT8 will be sent through a 5-speed automatic transmission featuring manual shift control via the steering