This morning with scheduled weekly maintenance, in addition to previously-planned adjustments to other classes, we deployed several changes to Hunters in Season of Discovery.
Hunter

Rapid Killing now reduces the cooldown of Rapid Fire by 80% (was a reduction of 2 minutes).
Chimera Shot weapon damage percent increased to 135% (was 120%).
Explosive Shot base damage before attack power increased by 50%.
Sniper Training has an additional new effect: while Sniper Training is at 5 stacks, Aimed Shot is instant.
Serpent Spread now causes Multi-shot to apply Serpent Sting to its targets for 12 seconds (was 6 seconds).
Steady Shot now deals 100% weapon damage (was 75%).

As we previously noted, there are more adjustments coming for Hunters and other classes. In general, we intend to improve the ranged playstyle and diminish the melee playstyle so that the two become more equivalent.
We apologize for the confusion caused by the changes above going live earlier than intended, and we intend to post more about further adjustments soon.
Thank you for your patience and understanding.