Playing a guessing game that would mean that he GPU may be a Adreno 430 set to 500 MHz. This is compatible with OpenGL ES 3.0, DirectX 11.1 and OpenCL 1.2 and capable of ensuring a pixel fillrate of 6 GPIX / if able to handle 500 million triangles per second. Of course it could be something different, but that is the thing with rumours you can end up building a whole product up without it meaning anything.
Still if our guess is right, the SoC would also be compatible with LPDDR3 memory up to 4 GB 1600 MHz. Word on the street is that Qualcomm should use 20 nanometers. If Snapdragon 810 rumours are correct then it could be a strong competitor to the two versions of Tegra K1. Of course it might not exist at all and you have just wasted five minutes of your life reading this.
It should be noted that a Qualcomm rep described octa-core chips as "dumb" last year, adding that Qualcomm engineers don't do "dumb things." In other words, the rumour mill hasn't exactly managed to convince us.