According to a bulletin from the National Highway Traffic Safety Administration, bolts on the vehicles' front driveshaft may not have been tightened to specifications, meaning that they could loosen over time. If the bolts loosen too much, it might result in a loss of power to the front wheels, which would cause a breakdown (at best) or a collision (at worst).
So far, the recall only affects vehicles manufactured between February 8, 2011 and July 29, 2011. In all, BMW estimates that 190 units are subject to recall.
If you own one of the affected vehicles, you should receive a notice from BMW next month. At that time, you'll be able to take your vehicle to a BMW dealer and have the front driveshaft bolts tightened free of charge.
Should you have questions in the meantime, we encourage you to contact your local dealer, or call BMW directly at 800-525-7417. Alternately, you can ring the NHTSA at 888-327-4236 and reference campaign #11V476000.