I see that in the Field Journal included in game that fatigue is to be effected by current load. It seems that my weapon sway is effected, yet it doesn't seem to effect my ability to get right back up and keep moving fast. Perhaps it is a problem with my perception and I am just used to fatigue in your games and that this is not as absent as I think.
In all probability fatigue generation simply isn't dialled in tightly yet, but I consider the generation of fatigue to have been a key feature in infantry play in previous ARMA/OFP games by BiS.