I have not received anything myself. Last email I got from Blizzard was about Classic.
Seems like the cross faction stuff hasnāt garnered much interest from those who have quit.
well cross play cannot fix inept devs and terrible story writing 
Got the mail, leads to this;
No one to invite though 
should start poking some old friends.
Seems rather optimistic expecting any worthwhile number of people finding five friends to come back.
What with them knowing the last proper patch was months ago, and the next proper patch being probably the best part of a year away.
This really.
Not really sure what Blizz were thinking people will be coming back for.
Aye itās unlikely many will return with this but with a little luck itāll last until DF or something. Donāt know anyone genuinely excited for the season of recycling thats coming up 
Blizzard: invite 5 friends
Me: hi cousins, wanna play?
Cousins: no.
Me: what about you Auntie?
Aunt: is there a slipper throwing class? 
Me: umā¦. No.
Aunt: then no.
Me: mom?
Mom: ohhhh my God why is he green? He looks like a demon! Why is this Goldshire full of Naked people! Why is this fox crushing on me? I donāt want you playing this game!
Me: welpā¦.
With the 4th season incomin with meh contentā¦ im not sure someone will answerā¦
Yāall have friends?
My friends will only be back once Blizzard adds new random bgs, increase rating gained/lost on rated bgs, pumps out faster buffs/nerfs and completely redesign the world for world pvp.
So the chance is basically zero because Blizzard does not care about bg community 
Maybe they will in BF!
I only have one inactive friend and Blizzard obviously donāt want her back
donāt you guys have friends?
I can only answer to pokes with bonk gifs, Iām afraid, Nag 
Jokes aside, wish you a lot of luck if you consider it!
Thanks for sharing!
Still had no email.
They know Iām Milly No Mates!!!
The Blizz do not know how to compensate for the outflow of players from Russia, which they themselves provoked, because āPolitics is out of gamesā) Naturally, there is no such action in Russia)
Imagine me asking my friends to play WoW when I donāt even know why I keep playing this.
"Hey friend! You want to play a game where you do dungeons, get useless fake rewards most of the time and get annihilated by PvPers because they have one stat that you donāt?"
"Want to play a game where the developers hate fun and the player-base?"
"No? Why not?"
Iād have 20 friends to bring back, but none of them will get back into this wreck what WoW is right now.