Its major rework. There have been a few recent discussions that have more details. You do have to replace the headlamp assemblies which is the easy part. You may be able to get from a dealer for about $2000, or perhaps ebay knock offs for much less. But then it gets interesting as you need a wiring harness adapters and components, which are not easy to come by. My recollection is that no one is completely satisfied with the quirks and the hoops you have to jump through to make them somewhat work. When I get back to a computer I'll try to do a forum search for recent threads.
2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6, 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac