This might concern Wrangler purists, but there are a couple of reasons not to fret. For one, although Jeep doesn't have a Selec-Trac system on the market to compare to right now, the old Selec-Trac system offered on the Jeep Liberty had a low-range for off-roading, so this one probably will, too. For another, only one kind of Wrangler will offer this feature, according to JL Wrangler Forums. The Selec-Trac system will only be available on the four-door Wrangler Unlimited Sahara, the version that's arguably the most luxurious, and the body-style with the longest wheelbase. All the others will only have the classic selectable four-wheel drive.
There is another interesting feature noted in the JL Wrangler Forums collection of information. Apparently the four-cylinder engine will have a combination starter and generator driven by a belt. This is interesting, because the only other car we've seen with such a component is the new Audi A8. In that application, the belt-driven starter and generator is used for smoother, faster starting and stopping to save fuel. We would guess the Jeep's system works in a similar way, though likely without the support of a 48-volt electrical system. We will likely know more when the new Wrangler makes its debut, which is expected at the L.A. auto show this year.