So, we recently had the GTX660 Ti launch which cemented the card as the go-to option if you wanted better performance on average over the competing Radeon HD7870, while also allowing the card to kick the HD7950 in the nads with a bit of overclocking. I mused on the existence of the GTX660 and even made a prediction based on what I knew from the GTX660 Ti analysis.
Nvidia does its OEM releases very quietly and doesn't want the retail sector to know that the cards exist, because these are only meant for pre-built systems from the likes of IBM, Dell and HP. But judging from the pattern we've seen, chopping down shader modules, cache and RAM from the GK104 architecture seen in the GTX680, it looks like my predictions hit the nail on the head. Woohoo!