(Not that this blog has or is meant to have any sort of ongoing readership, but if it'll be nice to leave some record for my future self — as a rule, your future self will never wish you had written less documentation.)
In short, most of what I've been working on since late 2013 has been under NDAs, and the rest feels too speculative to put in here. The latter reason feels somewhat like a cop out, so I will (fully acknowledging the empirically low rate of success of such intentions) to leave a more consistent record of what I'm playing with.