To clarify any confusion, the previous post (about "bendy bones") is NOT Pose Sculpting. That said, I absolutely intend to do some experiments with combining the two later down the track :)
What then is Pose Sculpting? This latest update might give you a clue...
In this video, I demonstrate one of the latest sculpt brushes that I've been working on recently. While not quite the elusive "Draw Brush" that I've been seeking, this technique still very useful in its own right. (It's also provided me with a few ideas about how I might pursue the holy grail).
Then of course, there are still many other things which I haven't shown yet! There are quite a few nice new things that are present here that weren't around in the first version, along with a massive list of things I'm still planning on trying (no, I'm not going to post this... IMO, the techniques you've seen so far pale in comparison when some of the things I've dreamed up are functional <evilgrin>)