I'm really really excited about the back trackpad, it's the feature that has me more excited as I've been thinking about possibilities on what to do with it.
Examples:
Gran Turismo - Using the trackpad as the gear shifting pads in a sports car, left would go down 1 gear and right would go up. You could also emulate a standard shift stick for manual drive cars.
God of War/Devil may cry: gestures for combo finishers, swiping two fingers down to activate rage of sparta/devil trigger, Quick time events with trackpad swipes.
Shooters: Tap to reload, swipe to throw grenade, two finger downward swipe to duck.
JRPG: Imagine swipes for the different spells. Join your fingers in the middle to cast Fira, Separate them from the center to cast Thunder, circled motion for a summon.
YES!!!!! I'm beginning to drool and can't concentrate at work :s
