Hello everyone. Here are a few answers to some of your questions on the upcoming change:
It will now always pick conduits that fit your spec including generic covenant ones. So if you have all your conduits at 239 now and start using it after the change goes live tomorrow, it will only find your spec and covenant ones to upgrade further to 252. You would need to change spec to get the other ones to increase.
Additionally, the upgrade item will not function if all the conduits for your specialization are upgraded. The item will remain in your bags for you to use after changing specs.
The drop percentage does increase with Torghast level. 
The Death-Bound Shard can only drop once a week in the Adamant Vaults.