This is what I think about it.
The most important thing for me is ragdoll but not some kind of shitty battlefield style ragdoll - I want something realistic - nice body weight so bodies will no longer slide downhill or downstairs - they must be heavy with all that equipment stuff(no bouncing off). Defragmentation would be a nice feature - 40mm frag shot thru the window and exploding inside - enemy looses his arm or leg.
And a second thing - blood and wounds. Currently I play Arma 2 with Ace2 blood, orginal bis blood, gl4 blood and slx wounds blood - that's what I call a neutralized enemy - a blood puddle on sand. Wounds - it would be realy nice to see a real wounds(not a texture fake stuff). As I saw on some gameplays and pictures in Arma 3 we will use mostly high velocity rounds like 5.56x45mm and some heavy rifle rounds like 7.62x51mm and I think those light high velocity rounds mostly scratch the target and make a small wound(outside) and some heavy rounds like 7.62x51mm makes a normal straight wound. It would be great if there would be some real wounds but not some giant holes(FarCry1 style). Maybe some headshot effects like in slx wounds.
Also Ive got an idea for bis - in slx wounds when somebody gets shot it's hard to pick up his gun/luncher because it gets some kind of unlocked from his body. In Arma3 when character dies or is wounded, his gun should be sticked to his hand or something, so he doesn't loose it.
I would love to see some Bis gore in Arma3 and Bis - there's nothing wrong in that relese date for me - You can even work on Arma3 longer because I know the longer Bohemia Interactive works on their babies - the preetier they are.