Why reduce the native resolution?
LED is a given. All LCD need to move towards LED backlighting.
Blu-ray is only interesting to me if it's a recording drive.
I don't care about 5.1 outputs on my Mac so long as I can send the signal to a Apple TV or some playback device that's HDMI enabled.
I'd love to see a keyboard with a trackpad like the Unibody Macs.
LED was given last time...not sure what happened.
Also, the chin is not going anywhere. There would be no room for the components (not that I wouldn't mind it leaving).