Built partially for the sake of the snipers is a revamped planning interface. Cover' assigns a 180-degree arc to a fireteam, while 'Defend' orders them to sit tight and scan a full 360 degrees. I tended to avoid using the last two commands, but that was personal preference. They're solid additions to the planning repertoire. Believe it or not, though, I felt that the best new features of RS were an extra pair of movement options in the action mode.
Soldiers can now lean left and right, and run while crouched.
The basic combat dynamic has been altered in a very good way, since you no longer have to expose yourself to enemy fire unnecessarily. RS allows you to peek around the corner first, cap any targets, then proceed. It was suicidal to run through the central area in multiplayer play. That map is back in RS but, because you can make hunched-over sprints, the scattered crates finally serve as the cover they were intended to be. I need guns.