[Jeepernator]

There seems to be one recall issued for the new Wrangler JL and it's for around 106 units.

Chrysler (FCA US LLC) is recalling certain 2018 Jeep Wrangler vehicles. The rear under body ladder rail may corrode, possibly reducing the strength of the rear floor pan and causing the left rear seat mount to become loose.

They don't have a fix yet, so it could begin on June 1st or after that for all we know.
https://www.nhtsa.gov/vehicle/2018/JEEP/WRANGLER/SUV/4WD%252520Later%252520Release#recalls

 

[Mudrunner]

Looks like it hasn't affected that many units, and hopefully they come up with a remedy soon. The rear seat detaching in a crash, sound likes a pretty serious safety concern.

 

[Goliath]

Although the number of affected units is low, I cant imagine that many JL's have been built so far. Hopefully they find a fix soon, so those with one on order will have the issue resolved prior to taking delivery.