btrfs (butter filesystem) is something that many of us have been interested in for years. Here is a very recent talk from LinuxCon Japan 2014. There is some Japanese at the beginning of the talk, but fear not, it is in English. The presenter is Marc Merlin... who if I remember correctly used to make really extensive LinuxWorld reports back when LinuxWorld still existed. Anyway, enjoy this btrfs update. Here's the slide deck PDF that goes along with the talk.
I wish I could find a video for the presentation on LXCF (pdf).