Well... the combat system I would like to see in this game is something fresh and new, I wouldn't like to see some batman stuff, whem you hit one bottom to attaque and other bottom to counter, nothing like hit this bottom now and you will be good, thats to much easy for the dangerous of Night City, it's based on tabletop RPG, but nobody said "tabletop RPG combat system" that you roll a dice and just pray for whatever you please, and the dice decides your path, I want this game to feel immersive and realistic, someone comes runing for you in the street, and if you falter for one second BAM! you are dead, that's reall life, you can't stop time to think what to do, of course that here, maybe you got some devise in your head to increase your reasoning but still life is passing and it never stops, I don't like how in mass effect series, whem you are fucked up and about to die you can "freeze" the time, get yourself some hot tea and think about what to do... turned base combat abolition in my opinion is an evolution(sorry but it's my sincere opinion), how you going to be really apprehensive in a life or death combat situation if you can have your time to think? well, actually you can hehe but anyway.
I don't want it to be so fast and flashy too like DMC, I want some next generation combat system, something new, deep. In real life if you want to fight close range, you have to think fast, it is inevitable, so if someone is hitting you from left to right, hold the "block bottom" and move your mouse/cursor in the oposit direction, not just hit one bottom... thats the real feel of a blocking, and just now the enemy have it's weapon on the right, hold the "attack bottom" and move your mouse/cursor to left, and you will cut him in his lungs (hehe) thats is some example of a fast, new and strategical meele combat system (this is just some example that I could think now and of course there is always easy mode ^^). same goes with shotting, hold the "aim bottom" and your character will hold the weapon strong (not necessarely just "aim" but something like prepare your arms and hands to shoot), and than you can shoot, if you forgot to hold the "aim bottom", you just hited the trigger before your arms and hands were strong enough to handle the guns impact and you just missed the target (or even hurted yourself, if your hand were still made of flesh haha), for field shooter, same goes with the fast reasoning, if you are a stealthy guy, there is positioning and timing, and a lot of skills and byonic devises to increase your aiming, holding, dodging, blocking, sonnar, radars (and maybe even some visor with an algorithm to tell approximately the target next moves based on where he is looking at or his heartbeat frequency, creazy stuff haha), also run faster, jump, camouflage suits, Bionic x ray eyes too see behind walls (with adjusted levels to see woman underwear xD) ...
in conclusion: realistic combat, modeled in character skills and the player skills, for immersive purposes, fast and smoth animations and moves, inovative comands (not just the same stuff of todays games), estrategical meele and ranged reall time combats, more or less thats what I wanted... =)