Sorry I posted in the wrong forum. Yes, it is about a piece of hardware but it's also making a bit of software use the hardware. At least that was my crooked logic.
Now I hope someone can suggest something to help.
The GTX 680 is a Kepler-class card. As you noted, this is not a card that Premiere Pro CS6 uses for GPU acceleration. You applied a hack to get it to work as far is it did, but you need to know that there is actually extra engineering/development work to be done on our side to make that card work with Premiere Pro.
I won't comment on when or whether that work will be done, but I can point to the fact that After Effects received an update just last month to use Kepler cards:
http://blogs.adobe.com/toddkopriva/2012/05/after-effects-cs6-11-0-1-update-bug-fixes-and-added-gpu-and-3d-renderer-support.html
You might be able to make some guesses about Premiere Pro based on that fact.