PowerBook Updates in September?

Appleinsider claims that Apple will be providing users with one more PowerPC-based PowerBook update before the switch to Intel.

The rumor site credits "reliable sources" who claim that the updated PowerBook is planned for the third week of September at Apple Expo Paris. Curiously, the sources hedge their bets by reporting that the Powerbooks have "recently fallen into a rut that could force a delay or even cause the company to scrap the revision entirely."

The updated laptop is reported to reach "near 2GHz" [See correction below] with internal support for dual-channel DDR2 SDRAM. The possibility of a high-density (1920x1200 pixel) PowerBook remains open, but few details are provided.
Update: Appleinsider has posted a correction instead of a "mere 300MHz boost", it is a "mere 30MHz boost".

"At the high-end, the new PowerBooks are expected to gain a mere 30MHz speed boost that would put the 15-inch and 17-inch models at 1.7GHz."