I swear, I saw the title of this thread and went to make a mushroom joke, but you beat me to it by FOUR MINUTES. I think the gods of luck are laughing at me.
(Your joke is amazing though! I would love a myconid supplement!)
Interesting that the alt cover depicts a death tyrant and a nalfeshnee in profile, and other art I've seen for this shows a nalfeshnee as well. Must play a major role in the adventure, perhaps?
Also, I wonder if there's gonna be any new monsters in this?