The interesting bit to me is the apparent staging of the plant retrofits to minimize downtime - the Cherokee plant gets converted for the new Wrangler, so that production of the Wrangler can move there while the current Wrangler plant is converted for the new Ram. Then the current Ram plant gets retrofitted so that Ram production can move back there.
That leaves the current Wrangler plant set up for Ram production, which ties in nicely with the rumor that a Wrangler pickup would be based on the Ram frame. At least that seems to be what the article is implying.
Which makes one wonder if a Wrangler Africa might also fit on such a frame.
I suspect the Wrangler will indeed be aluminum, on a steel frame, and I actually wonder if the Ram will go that way as well. Ford showed that it can be done.