Galaxy is working on a single-slot edition of the GeForce GTX 680, as revealed by some pictures leaked at an Asian tech site.
195w TDP is pretty high to be handled by a single-slot cooler, so frequencies should be expected to be reference or below. This device certainly will be nice for smaller, mid-tower PCs or for a cramped PC in which you want to run SLI. No release date or specifications have been released. For all we know, this could be a prototype that never sees the market.