Gobelyn just followed what Ankama said in the game designer's stream. Yes, these changes are coming, along with a few more, and you'll see them very quickly in the expansion's patchnote. 
Browse forums
Ankama Trackers
I think Gobelyn may have spoiled some upcoming nerfs.
By Fracastador#3166 June 25, 2017, 07:12:39
AnkaTracker
I don't speak french, so I can't follow what he said precisely, but it looked like he just spoiled several nerfs here:
https://www.youtube.com/watch?v=xCH88dAVTiM
Not 100% positive that I'm interpreting these right, but:
Psychopath maskermane: Now it's a 5/5, Edit: But it doesn't force either player to discard their hands. Just draws cards.
Mill sram is weakened, but I think it can still function with this effect.
Noxine: now it costs 2 AP.
I think that's a heavy blow to aggressive decks, and now it doesn't really look like a very good card at all to me.
3 star khan karkass: Now the fans he summons aren't in a line around him. They appear adjacent to him, so the two at his side rows appear one space backwards,.
That's a big difference, but I think he's still a good card.
First Ankama intervention
Respond to this thread
I think the maskemane now makes you draw 5 cards to you and your oponent but none has to discard.
You're right. Oops.
Gobelyn just followed what Ankama said in the game designer's stream. Yes, these changes are coming, along with a few more, and you'll see them very quickly in the expansion's patchnote.
oh no... Mimi is gonna get nerfed isn't she?! T_T