Stencyl is definitely still in development. As far as I know, new builds are being released almost every day. The reason that we can't see these builds, or any information about them, is because these things are only available to customers (i.e., Indie or Studio subscribers). I believe that once an update has all its major features and important bug fixes made, and is deemed ready, it is released to the public. However, I don't know when the next major update (3.2) will come out.