On the book "The Art and Making of The Force Unleashed", when LucasArts was discussing ideas for a next-gen Star Wars game, one of them was called "Star Wars: Jedi Master", a spiritual successor of the Jedi Knight games. Eventually it was dropped off because their concept was too "gore"(?).
That makes me think that if they eventually want to continue this series, it won't be a 'Jedi Knight III'. It will be something similar to the 'Jedi Master' concept.