The image of the phone used by Qualcomm seems to be the same one used by HTC, so presumably they are talking about the same device. Now it would not be correct to say that the HTC Desire 820 will be the first 64-bit phone from HTC – after all HTC did announce the HTC Desire 510 a couple of days ago.
However if the rumors are true, the HTC Desire 820 will sport a much more powerful 64-bit processor. As it stands the HTC Desire 510 runs on a Qualcomm Snapdragon 410 processor which is a 64-bit chipset, but with the Desire 820, HTC could be turning to the Snapdragon 615 chipset instead.
Also unlike the quad-core Snapdragon 410, the Snapdragon 615 is said to be of the octa-core variety with four Cortex-A53 cores clocked at 1.8GHz, and four Cortex-A53 cores clocked at 1GHz. In any case we guess we will learn more during IFA 2014 which is kicking off next week, so stay tuned for more updates!