Welcome to the forum, and to the X5 club!
I can't imagine it needs too much since it's certified. And it must be in great shape for BMW to have certified a vehicle with 66K miles on it.
Your headlights are already HID/xenon, but being an '11 yes you've got the factory halogen coronas. There are lots of threads on that - I would personally just get some inexpensive white halogen bulbs and call it good, vs. spending hundreds on HID bulbs that really look no better than a halogen replacement.
Here's 1 thread here -
http://www.xbimmers.com/forums/showthread.php?t=952763
Keep in mind most people post pics looking straight on - those typically look okay (though often in inner coronas is significantly brighter than the outer). Step off center and it's not going to look as good.
Got any pics to post?