Did a quick search but saw nothing. This just popped up in my feed:
Now through June 21, 2017, American Express® Card Members can get 25% more HawaiianMiles® when transferring Membership Rewards® points to HawaiianMiles®. Terms apply. http://amex.co/2rS5enh
Flash sale I guess? I’m just bummed that I booked my roundtrip flight from HNL > SYD.