Do we actually know that it is being deprecated or just stopping the ability to set it up on a new account?

I don't see anything official from AWS stating this. The other link mentions it will still get security fixes but no new features, but no indication of it ever being discontinued.

Is it possible that they simply are working on something new and want to minimize the migration at a later point? (I guess that is still technically deprecating CodeCommit if its something new, but its a difference).