Since the advent of the A7 chipset with 64-bit CPU architecture, which Apple has used in its flagship model iPhone 5S, all other premium smartphone makers have been planning to come up with devices with similar SoCs. Apple has used the SoC to the core and the OS also does support it pretty well. But in case of Android OS, it is reportedly said that it isn't yet fully tweaked to take advantage of a 64-bit CPU.
Anyway, just a day go, Qualcomm released two new premium chipsets with the same 64-Bit architecture. And a Chinese site called CNMO reported that ZTE is preparing a 64-bit Android smartphone, codenamed Apollo. Allegedly, it will be based on one of Qualcomm's new Snapdragon 808 and 810 silicon powerhouses. However, the sources close to the matter apparently didn't disclose any specific specs and specs of the supposed ZTE device with 64-Bit chipset powering it.
Apart from the Snapdragon 808 and Snapdragon 810, which are the premium chipsets with a 64-Bit architecture, ZTE might also use any of the other 64-Bit chips, which Qualcomm has in its pocket. To name a few, Snapdragon 410 and 610 are quad-core models for low and mid-range devices, which work on 1.2GHz and 1.6GHz, and are paired with Adreno 306 and Adreno 405 GPU's, respectively. The Snapdragon 615 is an octa-core 1.8GHz beast with the same GPU as the 610. The last two are more likely to be used.
ZTE's Apollo is just a rumor as of now and more information on the handset is yet to arrive. But if the rumors turn out to be true, the Chinese smartphone maker would definitely bring in a 64-Bit smartphone war into existence.