Will Apple have a new Mac Book Pro for 2021?

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...

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

I doubt they will tell you though.