An intriguing entry for "google Nexus 6P" is available in Geekbench's online score browser. The name is pretty much identical to the Huawei-made device that's been announced last year, but this Nexus 6P has different hardware.
Namely, it's powered by Qualcomm's Snapdragon 820 chipset (not the 810 like the 2015 model), and it comes with 4GB of RAM (up from 3 on the existing Nexus 6P). The prototype that's been benchmarked was running Android N at the time, which makes perfect sense considering that Google has already released the first two developer previews for that version of its mobile OS.
It seems entirely plausible that Google will stick with the Nexus 6P moniker for this year's Nexus phablet, just changing the hardware and the company manufacturing it. So this might be an HTC-made product, as rumors have been saying for a while. On the other hand, perhaps Huawei and Google are simply working on a minor spec refresh for the existing Nexus 6P, changing the SoC used and the RAM amount. If this is the case, then the upgraded phone could be made official at Google I/O next month.