It seems like a given, but NVIDIA is preparing another VGA card for release in the very near future: the GeForce GTX 980 Ti. The GTX 980 Ti would be a cut down version of the GM200-powered Titan X, with 6GB framebuffer and it'll be around 10% faster than Titan X, too.
According to SweClockers the new GeForce GTX 980 Ti would be the flagship card that NVIDIA will push, versus the Titan X. One of the reason this is, in my opinion, is that the new GTX 980 Ti can have add-in-board (AIB) partners play with the PCB and cooling setup, something that can't be done on the Titan X.
This will allow for some huge overclocks on the GTX 980 Ti, and some very exotic cooling setups. We should expect NVIDIA to unveil the GeForce GTX 980 Ti sometime in the second half of the year, after AMD launch its Radeon R9 390X.