Nvidia looks to have a pair of fresh GeForces up its sleeve. We already know an upcoming dual-GPU product is in the works, but the folks at VR-Zone have unearthed an entry for another unannounced card inside configuration files for Nvidia's latest beta drivers. The config file reportedly reads:
NVIDIA_DEV.1244.01 = "NVIDIA GeForce GTX 550 Ti"
NVIDIA_DEV.1083.01 = "NVIDIA GeForce GTX 590"
According to VR-Zone, the GTX 550 Ti will feature a GF116-400 graphics processor and a gig of GDDR5 memory. I'm not aware of any cards that use the GF116 GPU yet, so we may be looking at a fresh chunk of silicon with as-of-yet-undisclosed pixel-pushing resources. Considering the GeForce GTX 500 family currently bottoms out at around $250, I'd expect the GTX 550 Ti to be cheaper—perhaps $200 or less.
As for the GTX 590, past reports have already linked that name to a dual-GPU card much like the one we saw at CES. You're likely looking at a pair of GF110 GPUs (the same ones that power the GeForce GTX 580) and 2-3GB of RAM for that product.