The only reason NVIDIA hasn't released a GK110-based consumer graphics card yet is simple: GK104 is more than strong enough for this field, and GK110 would be overkill.
It also doesn't hurt to have a GPU ready for action for when AMD launches the Radeon HD 8000 series boards.
Indeed, according to SweClockers, NVIDIA will release the first godly board in February, under the codename GeForce Titan.
It is obviously an allusion to the Titan supercomputer, the world's strongest, which the Tesla K20 is used in.
GeForce Titan will have 5 GB of GDDR5 memory, an interface of 384 bits and a TDP of roughly 235W, plus 14 SMX units (2,880 CUDA cores), even though GK110 has 15 SMX normally (2,880 cores).