Is there a way to find out which are new tokens which would be listed on Coinbase over a period of time?
There is no way to know if any token will be listed in coinbase and more importantly when it will be listed. For example everyone knew ADA will be listed on coinbase for many years but no one view when its turn will come.
If it was possible to know before, then we would have collected those coins in cheap and kept them in our portfolio.