I find the notion of holding back cards or AMD having the ability to somehow react to a considerably faster card with anything but price adjustments silly. These cards take close to a year to get from tape out to being available in stores. Adjustments you can make after tape out are fairly small unless you're willing to spend a quarter or two and take it for a new spin. If we entertain the thought that GK100 was to be at some point and was cancelled afterwards, and a replacement GK110 was taped out in January like Charlie claimed, we'll be lucky if it launches this year. Nvidia named GK104 GTX 680 which should be indication enough that no faster single GPU is coming any time soon.