In an uncharacteristically quick move, the FDA released this official guidance less than a year after the draft was released for comments. This guidance for medical device manufacturers "recognizes today’s reality – cybersecurity threats are real, ever-present,  and continuously changing."

For more information on the FDA Postmarket Cybersecurity Guidance, see the below post from Dr. Suzanne B. Schwartz

http://blogs.fda.gov/fdavoice/index.php/2016/12/managing-medical-device-cybersecurity-in-the-postmarket-at-the-crossroads-of-cyber-safety-and-advancing-technology/