Bootcamp has already revealed that Apple has a new 16-ich MacBook Pro planned, although probably not one with its M1 chipset. The upcoming laptop may have an exciting piece of hardware inside, nonetheless. According to @TheGalox_, AMD has partnered with Apple to deliver mobile RDNA 2 GPUs, and ones that currently have no desktop counterparts.
Apparently, Apple will offer the next 16-inch MacBook Pro with the Radeon RX 6700 and RX 6700 XT, which AMD is rumoured to be building on its Navi 22 GPUs. There have been rumours about the desktop variants of these cards, but @TheGalox_ has offered no details on the specifications of the mobile versions.
It is common for Apple to source exclusive chips from its partners, whether that be AMD or Intel. The current 16-inch MacBook Pro is the only laptop with the Radeon Pro 5600M, for example, so this may also be the case with the Radeon RX 6700 and RX 6700 XT.
It is unclear when Apple plans to release the next 16-inch MacBook Pro, but there had been talk that it would be before the end of the year. Multiple outlets claim that AMD will unveil the desktop versions of the RX 6700 and RX 6700 XT in January though, so it may be until next year before we see the arrival of a new 16-inch MacBook Pro.