Aside from an incredibly sketchy 3dmark11 slide that appears to be fake, the Titan is "projected" as 85% of the 690's performance. It's also supposed to be a $900 card, and almost certainly very difficult to acquire due to limited stock.
I agree that it's worth waiting to see how things actually shake out, but there's only a small chance that Nvidia releases something as good as what you're claiming (and by the way, if they do, I'm buying one).