There will be no quivers for now, since people have been complaining about the OP of Inquisitive builds, that's for sure. It's been over five years since we have been suggesting and asking for a new quiver in many different forum threads, because since Mark of Death, we haven't had a good raid quiver. DDO needs a new game system designer, gameplay loot designers, and bug fixers, but NOW. SSG needs to stop introducing hundreds of bugs while fixing 2 or 3. It's not fun spending hours, days , weeks, even months farming items, and when you already have those items, they are buggy or not functioning correctly. That's not even about the absurd idea of creating ultra-rare loot tables, which creates unhealthy game behaviour for many people.
Quivers are made for characters who use ranged weapons like arrows and/or bolts to get an extra benefit. Melee with 2 weapons benefits from the abilities of the two weapons, casters benefit with two scepters, one in each hand, or a scepter, shield, or orb in the other hand. The same concept applies to tanks or one-handed melee weapons; they benefit from using a weapon in one hand and a shield, or an orb in the other hand, giving extra abilities. The problem is that everyone benefits from a quiver ability. They need to create a quiver with an ability specifically benefiting ranged characters. If they want to benefit non-ranged characters, they can create generic quivers so non-ranged characters will not have access to the benefits of the unique play style of the ranged characters. After all, if you want to play a character and use a quiver because of its abilities, make a build with ranged weapon capabilities and get the benefit of the quiver, especially for a ranged toon.
Another situation for quivers now is the problem they created with the aberration they did with Inquisitive. Fire 2 crossbows at the same time with no reload penalty is Absurd. In gameplay, how do you reload a crossbow with no hands? Instead, putting no holds barred as a permanent feat would make more sense. That OP will be less likely to give the chance to bow users to get a new quiver.