In my research, the QR code simply acts like a link to direct a person to a specific web page. The biller would still need to link the bill to a bank account or card to initiate any type of payment and that would have to be done at the bills originating location, not from the bank.
I personally would rather take a photo of my bill and approve payment with my bank or CU, not send my bank and CU account info to every bill location I may have to send payment too. Just for security reasons. JMO