New this build: 'ball' features have been added to the 'bullet' behavior, and two simple form controls. The text box is especially useful since there's currently no other way to get text input to a game, e.g. for hi-scores.
The form controls are native HTML form controls. They 'float' over the canvas - they're not actually part of the canvas - so you won't be able to display any objects on top of them. (That's not usually a concern anyway.)
On top of that, a solid batch of bug fixes and a few smaller additions. Families was due to be the next major feature, but we might have some interesting other projects coming up, so they might be postponed a few releases. It's definitely on the way though!