Its only new feature is export to Quantum Payroll. The Release Notes file includes a short instruction on how to use it. I have no information on how exactly the corresponding import utility in Quantum Payroll will work, so please contact them in case of any questions.
It hasn’t got the RC status, but, in fact, it’s only a release candidate or even beta-version because, unfortunately, it has not been tested fully, and hasn’t been tested with Quantum Payroll at all due to the urgent need to make it available. I will keep testing it and release an update in case of any issues detected.