I just got the answer to my question in an email form Nedbank. They intend to increase the divi from 7,5% of prime to 8,33% to offset the increase in divi tax. Hopefully the other banks will follow suit.
How noble of them to word it as a generous donation at the benefit of their shareholders. Sounds like what htey are really doing is adjusting the div payout since they no longer have to pay STC - which is what htey are supposed to do anyway.