Maybe a couple from what I've seen. Chances are it will probably have more realistic tanks driving over cars :D. But as for player movement doubt it, (Bouncy Bouncy!) even though I find arma2's still a little clunky.
Flir looks nice in trailers I've seem, nice looking JDAM explosions, reload animations. But these things are superficial, and I guess we'll only really know when we can compare the 2 by playing them.