I already know about these models, I was asking about the next "high-end" card(s).
I read rumors of a possible dual GTX 470s or GTX 480s under the name "GTX 495"?
Any truth to that? or is it just rumors? or will Nvidia release a more powerful single GPU than the 480?
I don't think there is any information on the GTX5xx cards. We just got the GTX4xx cards and they are still working on bringing us the rest of the line up. They are working on the GTX5xx cards for sure, but at the moment most of us are wondering about the rest of the lineup. I don't think I'd be looking for info on the GTX5xx for at least 6mo. A year from now is more likely.
I don't think the 6k will be here that soon. That would give the 5k series only a year of sales. Don't they cycle every ~18mo? Another rumor says they will be on the 28nm process of TSMC. And yet another says the 6k isn't coming until GF can make it. Either way(s) I don't think you'll see the 6k inside of 6mo.