The only thing that changed in bill pay is the look of the screen and the locations of some of the options. All existing payees and payments are still there and did not change at all.
If you primarily make payments from a mobile device or directly from the online banking home page, you will notice no differences.
If you typically go into bill pay to pay bills, you will notice that there is now an Options button to the right of each payee. You may click that button if you need to set up automatic or expedited payments, set up e-bills, or need to change account information.