Found this interesting article by Ulrich Eberl, giving a good summary about the current state (or state-of-the-art) regarding Machine Learning systems on a very non-technical level:

http://www.zeit.de/digital/internet/2016-10/deep-learning-ki-besser-als-menschen?wt_zmc=sm.ext.zonaudev.mail.ref.zeitde.share_small.link.x