Will Apple have a new Mac Book Pro for 2021?

Only Apple knows. You can contact Apple here: Contact - How to Contact Us - Apple

I doubt they will tell you though.

Anyone here who knows the answer to that question is already under non-disclosure agreement, and simply can't say.

Computers will always be faster, better and cheaper if you wait.

But if you have pressing work to do, and need a computer now, "hold your nose and vote" for one from the models available and working now. New ones always have some amount of issues...