As you can see from the specification the drive train still consist of the great I-6 and solid Dana axles front and back. They told me on the phone that the regular 2003 Wrangler will be the same. Although Jeep has been 'thumb nailing' the move of the Wrangler to the Liberty platform but the timeframe keeps getting pushed back. I did hear that it now looks like 2005 or so now. I will findout more specifically from some of my manufacturer sources at DC and elsewhere in the next few months.
Please check out the link with it wealth of specs, pictures and audio feeds from Jeep product engineering.
I will be one happy camper when I get my new 2003 Rubicon.