Since the other forum is dead, does anyone have any details about how big the playmat from the preorder is? I tried calling customer service but no one picked up.

Same as the others.

https://www.fantasyflightgames.com/en/products/arkham-horror-the-card-game/products/narrow-escape-playmat/

Never mind, I am glad I did not order the Investigators of Arkham for the playmat.

I think the Azathoth playmat looks better than the small ones just released, though! Not that I think it's worth pre-ordering a book I don't fancy to get it, mind...