Although not announced or done deliberately, some technical documentation popped up showing that Alder Lake, the processors following Rocket Lake, is indeed based on a Socket LGA 1700 de`sign, which means 1700 pins. 

It was Momomo who found and posted a screenshot that refers to a technical document, which indeed mentions 'LGA1700-ADL-S'. The document is grabbed from the Intel's site for developer tools with a toolkit for developing VR software. As you'll notice, mentioned in the name is LGA1700 and ADL-S. ADL-S could bring support for ddr5 and PCIe 5.0, albeit that is very much so, speculation. According to rumors, it will be 45 × 37.5mm in size , being a rectangle instead of the square that we are currently used to. This won't be the only big change Alder Lake-S would bring: Rumor has it that it will have a BIG.little design similar to that used in smartphone processors, with eight high-performance cores and eight high-efficiency cores.

Alder Lake-S could arrive at the end of next year, as part of the 12th generation of Intel Core processors.

Intel confirms large LGA1700 socket for Alder Lake In Developer Document