( If this is an inappropriate question, I apologize )
Those of you who've playtested the new Vengeance-style villains for the Villains of the Multiverse expansion: what kind of difficulty do they provide? The Vengeful Five pretty uniformly provide a super hard difficulty, akin to people like Iron Legacy and the Chairman. I'm curious if 'Villains' maintains that level of difficulty for "team" games, or if it provides more options, so that not all villain team games are super hard.
That's a question for designers. Us Playtesters aren't allowed to say things that aren't publically known.
I can't say the answer to that question, we don't even know the answer, and as Ronway said we aren't allowed to give that type of knowledge if we do.
That said the overall difficulty of the V format is going to be hard to change, because each round you get (H) card plays and (H) end of turn effects. So even if it gets easier than Vengeance 5 alone, it should still be a harder overall format than the stand alone villains.
Are you allowed to tell us who is the most fun?
While this is subjective, we aren’t supposed to give away anything. If GtG says it’s ok, then we will.
Pydro is the most fun, he just doesn't want yo sound braggy.
You don't need to ask the playtesters that- just ask Guise! He told me that he is… Huh, I didn't even know Guise was going to have a villain deck.
Guise has ALL the villain decks!
Plot twist: Guise was all the villians all along
Plot twist: Guise was also all of the heroes all along.
And all of the villains.
Confusing? Sure. To us.
But not to Guise!
Plot twist twist: Guise was YOU THE PLAYER, all along!
Plot twist twist twist: there is no Christopher, it was just guise all along!!!
...And in that moment I swear, we were all Guise
The greatest trick that Guise ever played was convincing the world that he didn't exist.
The greatest trick Guise ever played was making you think you had a quarter in your ear.
I'm not a playtester and haven't seen anything other than Christopher's public posts about the new VotM characters, so I'm free to say whatever I'd like 
To answer the OP question, I recall Christopher mentioning somewhere (on the blog? on Twitter? in person at PAx East?) that the new VotM villians would be a range of difficulties - from some easier ones, up to ones like the original V5 villains. Thus allowing the players to modify the overall difficulty of the group. IIRC, he implied that the orgininal V5 team would still be the toughest vengance-style fight.
So some of the VotM villains will likely be as tough as the original V5, but I do recall him saying that some of them would be easier.
You'll also be able to mix-and-match the new "Villains" villains with the Vengeance ones in whatever combinations you like :).