As a matter of fact, those bigger pixels are better pixels. Considering that I got nifty 13X19 print images from the original 4.15 megapixels, I suspect Canon made the decision to aim for quality over quantity.
While I would be surprised that they dropped AF at f8, many of us have been scraping by manually focusing the big lenses on lesser cameras using TCs. Gosh, maybe the focus confirmation is improved.
It will take a few field tests to see. I won't be placing an order until first adopters have wrung it out.