There's no word yet as to what specific foundation Lucas has chosen, but it's possible that it could be Edutopia, which is part of the George Lucas Educational Foundation, and he is currently the chairman.

In 2010, Lucas said to the Giving Pledge, "I am dedicating the majority of my wealth to improving education. It is the key to the survival of the human race. We have to plan for our collective future—and the first step begins with social, emotional and intellectual tools we provide to our children. As humans, our greatest tool for survival is our ability to think and to adapt—as educators, storytellers and communicators, our responsibility is to continue to do so."

Way to keep your word, Jedi Master George.