I gota say im not liking this new radar. In a 32 man server its just too busy and messy to be of any use and in game it seems as though it doesnt zoom out far enough to let you see where your team mates are, I do like the little direction arrows to show which direction your team mate is covering though.
As for the crouching, I dont think your player models height has changed at all, its simply that your pov is more accurate to what your model should be seeing, before this update you could crouch down behind an object and it looked like that object would be completly concealing you when in fact part of your head was still visible above it.