Its been Data mined. One change we know already is a LUA change - meaning some addon(s) are going to get broken.
My guess is that its addons like Raider IO or some weakaura strings that let the people who know how to read them see how many players there are.
Apprently it looks like theres 1.2million active CHARACTERS that have a covenant or are on the Threads of Fate quest. And i count for atleast 4.
On Topic:
Id like to see Conduit power removed and let you feely change soulbind and conduits as you can with talents.
Id like to see DS for warlocks made not dispellable, same goes for Combustion but also combustion NOT useable while casting.
Id like to see Holy paladin mana adressed, either up the pvp regen or reduce the cost of all offensive spells by a huge amount.
Id like to see a fix to the LFG system where you can see the CR of the person both creating and signing up - as with ilvl.
Id like to see that each spec at the highest rating achive a specific gladiator title. And yes, i mean 1 person per spec gets this. The highest Demo Lock gets one for example. And this would come from being at said rating when the season ends and having won X amout of games as that spec at a glad level.
Id like to see the AWC ui be made default for Arena. Yes we use addons etc to get how we want - and still could. But for Fred the new guy who doesnt really know all the ins and outs - a default ui that properly shows you what you need to see. AWC ui is great imo
Id like to see you be able to level 50-60 via covenant campagin, finishing with the last quest making you hit 60 with a full 197 upgraded covenant set - ready for Korthia.
Id like to see honor cap increased and made account wide.
Id like to see BGs award a reasonable amount of XP. It should be the same amount as completing a 5man, maybe even more since it typically takes longer.
Id like to see you recieve a token for CQ gear for each bracket you break - say, a month after the season started. Only obtainable once per bracket climb per season.
Id like to see the enforcement of the ToS about advertisment in LFG system. I need more mails from Blizzard about action being taken.
Id like to see boosting for gold in rated systems be bannable for buyer and seller.
Id like to see hunter pets do far less damage than they already do when LOSing their master.
Id like to see a higher mana cost on druid form swapping.
Id like to see condemn not charge with the pvp talent more than Once every X time
Id like to see kicks having an increased cool down if you get juked.
Id like to see racials disabled inside instanced content.
Id like to see disc to more damage than holy priest which isnt the case for some reason.
Id like to see Auto frenzy, auto darkness or any auto life saver scrapped. Cheat death and cauterize are ”fine” due to being grandfathered in.
Id like to see broadened transmog options. I can use my Silver Hand 2h mace legion artefact when i have a 1h and shield on, let me transmog any weapon type i can use, on any other weapon type.
Id like to see more glyphs.
• Lets shadow priests shadowform be a searing holy angel if they want and have their spells look more holy - no need to break the entire spec because its name.
•Let mages have all their spells be frostfire, god that was a sexy ability.
•Let paladins have more silver looking spells or more fire looking spells (sunwalker etc)
•More custom stuff is better 9 out of 10 times.
Id like to see flying mounts have a slowfall effect in no-fly zones. Like a Glider but far steeper falling curve. The goal isnt to travel forwards but to allow a safe landing while slightly directing your fall.
And lastly, id like to see the Follow command removed. It promotes botting and multiboxing in its various loop-hole methods. Not enough to say ”if i want to afk for X time to get a bite and put follow on a friend”. Its far to fringe and is the same as adding conduit power to stifle the top 50 players in the world, but you are instead making it easier for the druid armies to gather herbs on 5 druids at once just so Homeboy123 can /follow while he gets a monster.