Eyefinity Per Display Color Controls
Another Eyefinity option. Like some of the other features, though, it's quite self explanatory. From the 10.3s you'll be able to adjust the color settings like color, brightness and contrast of each monitor.
In the event you've got all the same monitors, this isn't really an issue. If you're using different monitors, this is a great little feature that will no doubt be useful in making sure all your monitors look as close to each other as possible.
Eyefinity Multiple Groups
Profiles are again something that people have been asking for; from the 10.3s you'll be able to run multiple groups and switch between them with ease. From a productivity stand point this is great for people in offices, as you can switch between a span setup, clone one, disable two monitors and more.
For me, I imagine this would be a great feature for someone with six monitors who likes to game on them. The problem is when you go to play something with a crosshair like a first person shooter, a six monitor setup becomes awful due to the bezels in the middle. What you could do, however, is set up one profile that has your six monitors in span mode and a second profile that disables the top three monitors and makes the bottom three go into span mode so when you fire up an FPS game your crosshair sits nicely in the middle with no interruptions.
Eyefinity Display Configuration Switching
This is really just an expansion of the above feature with you now having the ability to easily toggle between cloned and extended modes and your different profiles. There's really not much more to the feature.