On the Weekly Reset, there the automated Smolderon Orb weakaura has been fixed, but there are now only 3 Orbs.
There may be more nerfs or changes, but there are the ones we've managed to datamine.
Here is the tuning for Mythic Smolderon on the weekly reset.
It's clear from the first two changes that this is targeted at the Automated Weakauras for the Seeking Inferno mechanic. This mechanic is a private aura but players worked around it by using Weakauras that check who has Threat on the orbs. This appears to be fixed now which means that guilds rekilling or progging the boss will need to change their strategy. This involves likely reverting to the old Macro system that initial guilds used for the boss.
However, it's not all be bad news, as the final change is a large nerf to the encounter. An orb has been removed from each spawn down to 3 (from 4). This reduces the throughput and coordination needed for the encounter and makes the transition into each burn phase much easier.
There may be more Fyrakk changes, but the only one we've been able to datamine is:
This will make it more lenient to perform your CC chain once the adds are grouped up, similar to the Anduin Nerfs to nerf how often you needed to perform your CC chain as well.