M27 trial: USMC adopted M27 IAR to have a bit more commonality between guns and lighter 5.56 machine gun. The new news is that 3rd Battalion, 5th Marines have been training with these as a part of pre-deployment excercise.
Some of draw backs mentioned in the article is the tendency to expend more ammunition and the cost of the rifle itself.
Silencers for whole Battalion: 2nd Division is running a trial where they will put silencer on every rifle, from M4 to M2 .50 cal. This is to see if silencers can help with better communication with lower sound signature.