I'd really like to know if they would fit into a 2010 front end. I absolutely love xenon HID lighting. Had it in a BMW and it was like driving with the sun strapped to the front bumper. (Yes that was a little sarcastic, but you get the idea. )
As for the leveling, all cars with projector HID lights are required by law to have self levelers. These light bulbs put out a rediculous amount of light and when aimed wrong, can seriously blind oncoming drivers (like getting a glimpse of someone welding). This is so if you load up a trunk or bed, the rear squat of the vehicle won't be shining the lights up farther than they should be. You will see most cars run a self-diagnostic of the leveling motors every time you turn on the lights.
As for the drop-in kits... Worst idea ever! In a projector lense, the fish eye ones, they aren't bad. However in the standard reflector housings, you are doing harm to your light output and blindng other drivers at the same time. Reason is that the filiment in Halogen bulbs is placed in a standard location to be reflected by the housing and focus the light forward. The Xenon bulbs are like the flourescet bulbs in your shop, its a glowing tube of gas. While you will have a brighter bulb, there is no focused point of light, and the housing gets light from more angles and therefore spreads the bright beam wider (into oncoming cars).
(Climbing down from soap box now)
Anyways, if there is anyone in the know or has access to the new lights, could you try and see if the new lights would fit in the old location. It would be pretty expensive but for a much safer light, it could be worth it. These stock base model halogens are downright scary at night, the turn signals are brigher...