Yes it's direct plug and play, I've done a lot of custom work on G35 and 350z for all our local Nissan Infiniti club members. We have a guy "zjoe" over on
http://www.niclub.ca/ that's selling the 06 projectors for roughly $1100 if you're interested.
I've painted his headlights and installed all his lighting and they look like this now, swapped some bulbs for him too so yea working first hand with them I'm pretty sure DRL is retained meaning when you turn the car on the city lights come on, the city lights are the top ones right above the main projector.