Questions regarding itemization in 1.13

Months ago this was posted and only recently have me and friends started to give it serious thought in regards to setting up BiS Lists and the like for Classic. Members of the Theorycrafting community have made assumptions in regards to these itemization choices, such as Choker of the Fire Lord and Ring of Spell Power not being available (or existing in their pre-buff states) in Phase 1, while still assuming items like Ban’Thok Sash and Savage Gladiator Chain will exist in their buffed state. A Blue Post about what items will exist in their buffed states, when they will be added, and what exactly is meant by the last several sentences of the original post, would be greatly appreciated and make things like constructing BiS Lists much more concrete and less speculative.

A post about this would help clarify what items need to be prioritized and help people tailor their expectations in regards to drops.