I would love to see a AP Computer Science A course added to Khan Academy.
The current computer science content on Khan Academy only covers a few general computing topics, and Computer Science Principles, which is a completely different course in terms of content. Computer Science Principles is more of an introductory course to the idea of computer science in general, that doesn't focus on any specific language, and includes topics such as ethics and global impacts of computing. CSA, on the other hand, is a focused on the practical skills required to program, specifically in Java. While they seem similar, the style of questions and the content of the AP exams are pretty drastically different.
I love khan academy for it's self guided pace, and mastery system, and would love to have it as an instructional tool and course review for AP CSA.