ArenaNet, "Since the launch of Heart of Thorns the Team has been monitoring feedback regarding the changes to Fractals. We’ve noticed several issues with fractal balance and rewards that are especially prominent above Fractal Level 50, and the team is working on some adjustments that we are planning to ship in December. We wanted to give you an overview of what’s coming."
Balance - Toughness scales in Fractals 1 - 50
Ascended Drop Rates - Drop rates will be increased, similar to what they were before HoT
Mastery Experience - Experience gained will count towards masteries
Gold - Increased amount of gold from Fractal Encryptions
Detailed information on each of these categories can be found here:
https://forum-en.guildwars2.com/forum/game/dungeons/Upcoming-Fractal-Changes