Well I've heard whispers of the project for two or three years now, actually. And it was about a year ago Keanu Reeves was associated with the concept, but that article is the first time that he personally voiced and interest in the project. No telling how far along the development is. The same thing with the Dragonball film. Everyone thought it was never going to happen until all the sudden they announce that the movie exists, and that Goku and Picollo had already been cast. It came out of the blue, pretty much.
Then again, the Bebop movie may never go anywhere. It may be just another "Halo" movie.