I've never played Arkham Horror or Eldritch Horror.
I have base game Mansions of Madness 2.0 and everything for the LCG, which is among my top games of all time.
If anything this looks more like Arkham Horror: The Card Game: The Board Game.
Between the LCG and Mansions I’m not really sure what this offers.
Mansions is more thematic and immersive and the LCG is fantastically deep, better narratively and can be set anywhere.
AH 3.0 looks mechanically like a halfway house and has a much narrower setting.
I'm also concerned about how scenario based it will be. One thing that is great about the LCG is that it's effectively 2 games in one - first the narrative exploration of scenarios and campaigns when they are new or new-ish to you and second - the optimisation puzzle of trying to 'beat' them whilst exploring the player card pool.
Of course Arkham 3.0 doesn't have deck building, a player card pool and I imagine the different investigators are less asymmetric (a bit like in Mansions). So I'm worried it'll be less replayable and completely reliant on expansions.