I would personally love it if ESO would randomly revisit old sets and buff them without posting what they have done. This is something ESO could do from time to time at it's own pace to give new life to old contents and sets that already exist, giving a fun element to the game with random results and discovery to older things the dev's placed a lot of time and love into.
For example Mad Tinkerer could have the stun buffed to 4 seconds or have the fabricant cause a bleed debuff.
just a thought, there are so many sets that can be tweaked mildly to create a random fun effect for players to discover.
Please consider this.