From what I can gather off of Allpar.com, the only possible version of the 2007 Wrangler that could be using the same frame as the Dodge Nitro is the Wrangler Unlimited X. I have to say that the Wrangler Unlimited X looks pretty damn sweet.
It does look like the 2008 Liberty will be sharing the same platform as the Dodge Nitro though (Just as the upcoming Compass and Patriot will be sharing the Dodge Caliber platform.).
Myself, I'm liking the looks of the next generation Stratus (Being renamed the Avenger, which was the original name of the what became the Stratus Coupe). It looks like a shrink of the Charger with the front end of the Caliber. It's sibling the Sebring, has gotten a Crossfire inspired makeover.