Ok. I did a little Google Earth magic and overlayed the extended(yellow) over the old(green) Boatlanes to illustrate the new(in yellow).
Extended has new or extended trails into Chaney, Ford, Ray, Dale, Big Mustang, Oil Well(?), Birch extensions, Lake Fork Marina, 515E-to-Long Branch, Searcy, Bell, Rogers, etc and etc.
I'm pretty sure this Fork version was just released, like in just the last week.