All Outdoors Tech has an article indicating that USMC is working with Colt Canada to develop a new rifle that can be better connected to a new system called Integrated Soldier System that can connect all soldiers on the battlefield. Colt Canada has been workin gon the program called SWORD System.
The rifle itself shows some development.
-Integrated sound suppressor
-Monolithic uper receiver
-Improved collapsible stock
-Built-in modular power & data rail system
-Central power pack
-Digital optic sight
You can see more of this in the video starting about 15:15
From: All Outdoor Tech