Is high school physics complete?

Hi, I see that high school physics is out of beta. But the material looks really sparse. There are a lot of gaps. For example, the first lesson jumps straight to Newton's Second Law and refers to forces, velocity, and other concepts without defining them or giving any background explanation. 

Is the course going to be fleshed out more, or is this the final product? Because right now, it doesn't seem useful for self-study unless the learner already has a lot of experience in this subject.