They also ran a 4 year/48,000 mile or 5 year/60k mile warranty (depending on the generation) on vehicles that were modified under the emissions fix. This includes the entire engine and fuel system.
They did something similar on the 3.0L. Have a friend that they extend the warranty on his 2014 Grand Cherokee with the 3.0L TD. Not sure of the exact amount of extension they did though.