Chrysler has said recently that the new Wrangler will have solid axles. Apparently there will be some use of alloy to reduce weight. It may also have a new 8-speed transmission.
If Dana has been contracted to build the Bronco axles (and I read an article where Dana confirmed this) then it is most likely that the Bronco will have solid axles. Without that, they simply cannot attract the hardcore group of off-roaders that truly build the credibility of a vehicle like this.
While a lot of people who buy Wranglers will probably never go off-road, the Wrangler maintains its offroad credibility and attracts the more hardcore offroading community to it. That, in turn, attracts a larger group of buyers who love the idea of the offroad credibility and want a vehicle that looks iconic. I was/am a Toyota guy and the Wrangler (my 2nd) was one I was drawn to after I took a stock Rubicon offroad in Ouray. fully knowing that it would not match the overall reliability of a Land Cruiser or 4Runner over time, I still bought a 2012 Rubicon and now a 2014 Rubicon. If the FJ comes back with solid axles, a torquey V6, the 4.6 V8, or powerful diesel, and regular doors, I could be first in line to trade my Rubicon.
The new 2018 Wrangler has not changed much externally, and still retains a very similar look. Besides a just slightly more sloping windshield, LED headlights, the alloy skin, and some other minor changes, it looks the same.
It is too early to tell what the Bronco will look like (and my offroad buddies and I actually think that the F-150 looks quite good, though only 3 own them) but I suspect they will do a good job with the, given the target demographic. There is no point bringing it back with IFS because it will not sell well with the true offroad crowd that is the only demographic that will actually build its offroad and overloading credibility and reputation. Without that, I personally feel that the new Bronco will sell only a little better than the FJ did and that would not be good enough. I could be wrong, but I think if they do want to take on the Wrangler and its 200,000+ units of sale each year, IFS will not cut it. I certainly would not buy one, nor would practically any of the 80-100 people I know if different offroad clubs.