Wowsa, That's A LOT of gears!!
I hope they do it right. When I bought my 05 Mustang, I anxiously awaited the 5-speed auto. I was thinking this would give me better hiway milage, as it would be cruising at lower RPM's than a 4-speed auto. NOT true. It turned out to be the opposite. First gear is tall for fast starts, to make you feel like you have a muscle car that will launch. In everyday easy driving, I'm in second gear at 5 MPH.
So really, that is a wasted gear on me. With 8 gears though, G.M. should be able to spread it out a little more... I hope.
Mike