This game is a massive project, which is being created by volunteers in their free time. Thus, one cannot expect it to be rushed through production. Generally, new content comes in the form of teasers (updates to the storyline), demos (updates to the game engine), story snippets (updates to the overall storyline), or mini-games (updates to character artwork).
The primary focus at the moment is the storyline, which the next teaser will focus in the form of a cinema sequence on the origin of Jasper, one of the main characters.
The final release date is unknown because most of the volunteers vanish without a trace, and the core volunteers all have busy lives. Development is on-going, though.