Pretty sure theres no melee. If anything it will definately just be executions in different animations. Its a stealthgame. Kinda like Thief or older Splinter cells. I wouldnt understand how it would work even if they did add proper melee. Everyone has guns in Deus ex. It aint Sleeping Dogs, where you get to do your kung fu majority of the time, because everyone is unarmed. Unlike in cutscenes and movies, trying to fist a lot of armed guys ingame or in real life is a really crap idea.