MacBook Pro 16-inch with Apple M1X processor has been tipped and it is said to come with 12 cores instead of the eight cores found in the M1 processor. There is no information on a launch date but the tipster states that there will be a press release for the same.

source https://gadgets.ndtv.com/laptops/news/macbook-pro-16-inch-apple-12-core-m1x-processor-tipped-press-release-intel-2332094#rss-gadgets-all