Besides Ivy Bridge, some slightly more current Nvidia/AMD GPU, and probably USB 3.0, the update more than likely won't be too enticing. I doubt any sort of redesign would make an appearance. But the performance upgrade should be pretty sweet, and anyone with a C2D machine or older would probably find the update vastly beneficial (especially with an upgraded or standard SSD).
I think it'd be a neat move to nix the ODD, put an SSD there as the boot drive, and keep the 1TB as a storage device. Then when doing a BTO, having the options to upgrade the SSD, upgrade the standard HDD, upgrading both, or possibly going with two SSDs and RAIDing them. Obviously you can already do most of this and still have an ODD, but for it to be standard to begin with would be nice. I'd take an SSD over an ODD any day of the week.
Anti-reflective screen would be cool, but I don't particularly have any issues with mine, besides seeing my ugly face when it's off
Wireless charging for the mouse and keyboard would be very forward thinking, especially if they made it compatible with the next iPhone.
Oh, and having a backlit keyboard (which certainly seems unnecessary to most people sure) would be a nice addition. Not particularly needed, but hey, why not? (Especially if charging was as easy as putting the keyboard on the stand or under the chin)