So far little information has slipped out regarding VJ. I hear it shares a platform with the next generation Cherokee (KJ), and that it will be assembled at DC's new Jeep® plant in Toledo. The Buzz is that it won't be a radical departure from the TJ.
The biggest change will be the retirement of the venerable 4.0 liter inline six. It will be replaced by the Chrysler Group's all new 3.7 liter V6. The new Powertech (Hemi) engine is estimated to put out around 200hp with 225 lb. ft of torque while delivering superior fuels economy.
Another new feature will be a modular top like the one show on the Mountain Biker concept unveiled last fall at SEMA. Similar to the one used on the Icon concept, the top has an integrated roll cage and can be configured in several different ways using easily removed panels (two in the roof, two side panels, upper door panels and a rear hatch).
The article also touches on the topic of whether the next TJ will have independent suspension or not. Be sure to check it out!