I test drove a brand new X3 and it had the new iDrive. According to the CA, if you do a build now, you get the new one.
[EDIT] I looked at some articles online and I am not sure the CA was right. What I drove did not have the iTouch controller and there were no 3D maps.
Personally, I didn't care for it. Many many menus and it was clunky to get back to the Navigation screen. It always went to split screen. The CA couldn't figure out how to get it to go back to full screen Navi without touching the controller.