So we all know and understand that at one point Nvidia will release a Dual-GPU GeForce GTX 790 right ? Whenever that happens, I do not know for sure, maybe March e.g. CeBIT time though. It is very likely that product will get two 780 Ti GPUs e.g. full GK110 cores with 4992 Cuda Cores, 416 TMUs and 80 ROPs. It would be a beast of a card of course. Titan however now is rumored to get an update as well, the GTX Titan Black Edition.
Basically the GTX Titan Black Edition would become a new GK110 based card featuring the full 2880 Cuda cores, 240 TMUs and 48 ROPswith 6 GB memory running along a 384-bit interface. Clock frequencies are not unknown but it will get a 250W TDP and black colored Titan NVTTM cooler and the card would get full double precision enabled.