For a long time the uefi.blogspot.com was one of the only sources of UEFI blogging. It appears to have been inactive for about 2 years, but has 2 new posts from this month! Make sure this blog is still on your RSS feed list.

http://uefi.blogspot.com/2016/10/intel-and-insyde-embedded-white-paper.html

http://www.intel.com/content/www/us/en/embedded/software/fsp/fast-secure-iot-solutions-insyde-software-blink-boot-fsp-white-paper.html

http://uefi.blogspot.com/2016/10/pi-15-released.html