Hmm wonder if Minion Client has Classic addons working for launch ? For few days i've tried to search any Wow Addons at Minion client "using with ESO only", but always end up finding 0x even retail Addons. I might start using ESO addons also via Twitch Desktop app if there's a backup option like Minion has. Will see about that later if can stand the hassle of redoing their settings in ESO if have to do it once reinstalled with Twitch Desktop App.
2nd thought / question: Wonder if Spartan UI works also with Classic at launch ? At Pre Launch Stress test i was using Stonewrought UI that's pretty Dwarven style UI & some other cosmetic addons. Not ones that simplify prog. At latest vid that saved in Twitch has Antonil'z UI, Dominos & couple others in use. Prob. installing Stonewrought UI with Dominos at launch & using Squidframe. It's available here in wowinterface.com. Hope it works with Classic's Re-Release. Can see my UI setup from my Twitch channel which can be found from my Profile page ^^ I hope i can find most addons shown on this vid's details area here in wowinterface.com
https://youtu.be/v3tWBfLWZEM
I'm not gonna use all shown on the video cause some are ruining the Classic feeling & they also simplify the char progression too much. Def. NO to Questie, Trinketmenu & & same with Joanasworld Classic Leveling Guide.
Shame on this person for showing questie for example as
many who dive into Classic go there cause of the fine Non Simplified features Those that were not integrated by Blizzard in good old early days <3 Many also drool for golden Talent Trees & other early days gameplay features like able to use
3x Warrior Stances, Feed specific food to Pet, using Ammo & to watch for Pet's Happiness 
<3
Can't wait to Fish up tasty Fishies for mi Pet like i did in golden early days. Would be nice to have Housing & Farming in Azeroth & then feed your Pet with the Veggies that got from your Farm :P
Ok almost forty's RPG'er starting to dream too much.. Here's image from my current Favs list.
Wish nice gaming & time in Golden early Days Azeroth for everyone o/
Kindly: Fedaygin