Not sure if I missed it but what happened to the Borderlands 2 demo at PDXLan? I had read that it was supposed to run on Kepler, did that happen?
A quick Google search throws up the hilarious news.
The special presentation was apparently Borderlands 2 on... a Tegra 3 tablet.
Nothing to do with Kepler at all.
http://forums.guru3d.com/showthread.php?p=4249326