Although it did not unveil a lot of details during its keynote at MWC 2015, the company did say that the Snapdragon 820 will be built on a FinFET manufacturing process, so it is either TSMC's 16nm or Samsung's 14nm node.
Qualcomm also noted that the Snapdragon 820 SoC will be part of its new Zeroth platform and feature the first with 64-bit custom Qualcomm ARMv8 CPU core, named the Kyro.
While Qualcomm was unwilling to shed any more specific details regarding that custom Qualcomm CPU core, or the GPU part for that matter, it did say that first samples are expected sometime in the second half of this year.