Xenons on BMWs have been auto-leveling since they were first introduced. This would be up and down movement. All BMW xenons (bi or not) have this.
The adaptive feature (steerable left,right,up,down) is only on the March '03 and after production date (the '04 model) vehicles with the xenon option. Also the adaptive feature is only active when the light switch is in the A position. In the ON position only auto leveling is active.
Tyler if your light looks like the one in the thread you referenced, then you have the adaptive xenons. Check your sticker cause I am reasonably certain BMW gives no free lunches.
BTW, I have noticed that my halogen hi-beams are auto-leveling.