They changed to DX9 if thats what you mean. I recommend not to try it out right now because the game has more bugs and glitches than ever before. take a look at the official tech forum and you will see what I mean. right now it looks more like a early beta or late alpha.
This comment was edited on May 4, 08:27.
I have given up on waiting for BIS to come back to their senses and do a real ArmA 2 successor.