So from what it looks like on your guide and pictures I've seen on the web, the color changes are:
Dark Side -> Guard : not as dark, but not sure quite how much lighter and how green
Sterling Gray -> Magnetic : ??? pictures are all over the place on how dark it is
Ice Storm -> Tectonic : now a plain light silver
Sunset -> Bronze Fire : more brown than red/orange for the base??
The colors that really interest me are Guard and Bronze Fire. The photos I've seen of Guard are anywhere from a light gray with just a hint of green to a very dark green/gray that is almost as dark as "dark side". Bronze fire also seems like it is hard to pin down. The color guide posted here makes it look like a brown base, but the Superduty color guide on Ford's website shows it as very much Orange.
Magnetic could also be a really good color if it has the Xirallic shimmer like Tuxedo Black.
I still think the Fusion would look best in Ford's Green Gem paint, but they seem determined to only offer that color on the truck lineup.