As far as performance goes I am not really impressed. The game hardly utilizes the gpu still. I was playing Tanoa wasteland last night and was getting around 40 fps everywhere, but I noticed my gpu was running so so cold.. Only at 45 c? Then I loooked and the core clock was not even boosting up, the only other game that I have played that this happens in is csgo, but when it happens I am still getting 300 fps in csgo... And actually csgo will boost up 50-75 mhz depending on the server I am in.
So my conclusion to this is performance might be better, but they still aren't using as much gpu as they could be. In dayz my fps never drops below 50, and that was in the middle of cherno. Now the fps may be so low because of the wasteland mod I was playing, I don't know how optimized it was, even still I'd like to see arma push the gpu more than it was.
Also the new map and vehicles are awesome! Might be one of my favorite arma expansions so far.