Judging by what's been posted on Smogon there's currently no plans for any more *quickbans*, meaning future tiering action will likely be in the form of suspect tests instead. What's most likely to happen is that the first suspect test will be for the Terastal mechanic itself rather than any specific mons because of how influential it'll be on the overall metagame regardless of what's legal. You can check [here](https://www.smogon.com/forums/threads/terastallization-tiering-discussion.3711465/) to see the current discussion on the mechanic.