Since webOS is being made open-source to keep it alive (thus entering Android territory), HP has made it official that the code for open webOS 1.0 will be available this September, while the Enyo 1.0 and Enyo 2.0 code is available today. What is Enyo, you ask? It is the application framework behind webOS 3.0 used on the Touchpad; when all versions of code are compiled together, it will be known as Open webOS 1.0.
As for current webOS users: you’ll need some hacking skills to make these developer tools work on your Touchpad, however HP is looking into ways of making the Pre, Pixi, and Touchpad compatible with the upcoming Open webOS — all they need is time. Via: HP webOS Dev Blog