Red,
That's speculation. We don't know what Hyperion's contract covers in reguards to development of Amiga OS 4. It could be just 4.0 or the whole 4.x series. What Amiga, Inc. is working on in house could very well be AOS 5. Which would be sort of consistant with what Amiga, Inc.'s previous management laid out. Granted the grain of salt nature makes this all rather speculative and foggy.
Though I do thing that what Amiga OS 5 (what AI is working on operating systemwise) will be unlike any AOS we've seen. Which gets me abit concerned.