I ordered a LR RWD M3 March 19th. My car delivery is now impending. I've already paid for the car but there is still an "upgrade to autopilot" button enable. Just for fun, I pressed it to see what the cost might be. If I upgraded to Autopilot before delivery it would be $CDN 4,000, $CDN 5,300 if after.
Oh, $4k Canadian. My apologies, I assumed you meant USD.