This post seems outdated considering these more recent HN posts:
Disabling Intel ME 11 via undocumented mode (ptsecurity.com) https://news.ycombinator.com/item?id=15116719
How to hack a turned-off computer, or running unsigned code in Intel ME (blackhat.com) https://news.ycombinator.com/item?id=15298833
Personally I am extremely curious about the upcoming blackhat presentation. If it is really true this might be very big.