GeForce GTX 590, you're not alone. The dual-GPU solution was expected to arrive at the PAX East get-together this month but seemed to shyly dodge the limelight, though now there's no escaping its date with destiny. Just make sure to be up nice and early tomorrow, say around 9AM US Eastern Time, for the inevitable barrage of reviews. An unsatisfyingly brief teaser video, featuring Crysis 2 slyly running in the background, can be found after the break.
Update: Whoa, Nelly! Looks like it may end up being the GeForce GTX 590, as evidenced by these leaked images here.