According to a rumor from 
LeaksApplePro, Apple will release a MacBook Pro 16" next year with a new, more powerful version of the M1 chip.
The chip, provisionally named "M1X", is said to have 12 cores - 8 performance and 4 energy-saving cores - which would be a significant upgrade over the M1 with 8 cores. More cores would be the logical next step, if Apple wants to launch more models with Apple Silicon in the future, in addition to the three models with the new M1 Silicon (MacBook Air 13", MacBook Pro 13" and Mac mini), which should differ from the previous ones - apart from a larger display - by a higher performance and more features.
Apple has differentiated the performance of the three M1 models by using a different clock rate for the identical central hardware - apart from MacBook Air, which has been reduced by a GPU core: the MacBook Pro and Mac mini - unlike MacBook Air - have active cooling, which allows the M1 to operate at a higher clock rate for longer periods of time.
The new 12-core M1X in the MacBook Pro 16" will most likely also have a higher clock rate made possible by active cooling. Another possibility for performance improvement for the M1X - which is not mentioned in the rumor, but is likely - is to add more GPU and Neural Engine cores and more CPU/GPU memory - the M1 models have a maximum of 8 GPU and 16 Neural Engine cores and are limited to 16 GB RAM. Theoretically, the M1X could also be equipped as a SoC with additional new (or improved) integrated hardware units to accelerate special tasks - so far, for example, the M1 Soc has units such as an image signal processor, crypto and en-/decoding engines.
MAcBook Pro 16"
Here our articles about the new M1 chip: Blackmagic DaVinci Resolve GPU tests with Apple M1 MacBook Pro 13 inch and https://www.slashcam.de/artikel/Test/Das-MacBook-Pro-13--M1-im-4K--5K--8K-und-12K-Performance-Test-mit-ARRI--RED--Canon-uva
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