Francois Tigeot gave talks at EuroBSDCon and XDC 2014, and he’s posted slide and video links. He covers DragonFly and Postgres and video drivers, or at least I assume so cause I haven’t watched them yet. There’s other BSD-specific material available too, according to his post.
A running description of activity related to DragonFly BSD.
There is a review of his talk on this week’s LWN, together with the FreeBSD and OpenBSD talks (subscriber-only until next Thursday).