According to images uncovered in a macOS catalina beta, it seems like Apple is working on a 16-Inch MacBook Pro. This was first uncovered by the blog: MacGeneration.
The images are actually icons, and comparing it against the 15-Inch model you can see that the bezels around the display are thinner. This could suggest that they will be able to fit a 16-Inch display in the current 15-Inch form factor.
The rumors claim that Apple is going back on the keyboard design and will switch to the scissor mechanism that has proven to be more reliable.
It is also said that the 16-Inch MacBook Pro will have a 3072×1920 resolution and use Intel 9th generation coffee lake refresh CPUs.
Personally I am curious on how Apple is going to tackle the keyboard issues plaguing the current generation. I also hope they will change some of their design rules and make room for good cooling that enable the full performance of powerful CPUs and GPUs. We recently saw a change of design in the iPhone 11 where they made it slightly thicker and heavier. Apple usually designs their product as thin as possible. Maybe we are seeing a change in that philosophy?
If they make the 16-Inch MacBook Pro a bit thicker with good cooling and a solid performance boost, I think we have a winner.