More information is spilling out on the 2018 Jeep Wrangler. A member of the JL Wrangler Forums has gotten images from the FCA dealer system which now features the 2018 Wrangler along with a litany of options.
One of those options is a full-time four-wheel-drive system called Selec-Trac. If history any indication, the Selec-Trac system will likely offer a low-range mode like on the 2008 to 2012 Liberty. Before you start grabbing the pitchforks and torches, Selec-Trac will only be available on the Sahara.
We also have gotten an interesting tidbit on the 2.0L turbo-four. It will come with a "Belt Start Generator" system. We're guessing this will be used with a stop-start system to save fuel.
Source: JL Wrangler Forums