No they've put checkpoints in the game at certain places. The problem with them is they don't have the enemy's locations, or who's dead/alive.

They're so broken, people come back alive when you restart a checkpoint. IO are tweaking the checkpoint system.
As far as disguises go, people whose disguise matches your own can spot you so easily. So they don't really work as intended. IO acknowledged they're poor, but won't be fixing it.
