USCIS officially announced the addition of a $10 registration fee recently. They say that this non-refundable fee will be required for registrations that are submitted as part of the FY2021 H-1B cap process.
This, of course, is assuming that testing of the system has actually been completed. Currently, it is not complete, so the new registration requirement has not technically been added.
In fact, USCIS has said that it will provide the public with “ample notice” before officially implementing the requirement. What does this mean? There’s no specific answer. But as soon as a formal decision has been made regarding the FY2021 H-1B cap process, USCIS will likely announce the timeframe of implementation, as well as the initial registration period, in the Federal Register.
You can read more about it in the USCIS announcement.