My guess is that itll be around anywhere between 59-62 for an A. People are likely to have done because theyre better prepared after trying last years paper, they'd also be likely to have been taught with IAL papers too and they are probably going to be lots of resit students who have done C3 and C4 hence at an advantage.
However it was a tough paper with a non-traditional style (lots of 2 dp answers, logs was different, integral question was negative etc etc) and small things would have thrown people off.
63 I reckon would be safely be an A.