Oh man, Darkhold? Part of the AD&D Castles Boxed Set, fleshed out NPCs, great maps, Battlesystem, and a fun plot to build castles by the "lowest bidder" Zhentarim agents that had built-in weaknesses for the Zhentarim to take advantage of. This takes me back. Hope they do it right.
No clue why you are being so hostile and rude, but since nothing was done after I reported this comment, I guess you really are one of the pet members of this forum. It is always a shame when mods do not treat everyone equally, especially on sites that claim fairness and inclusivity.
I've done a quick look-through, and it's pretty interesting so far. Most notably, the stat blocks for Fzoul Chembryl and the Pereghost both utilize Mythic Actions, first seen in the Theros book, which makes me suspect even more that this will become something of a standard for high-level foes.
Great preview. This is a quality production, easily on par with a WotC book. I'm tempted to buy it...although the 16th level PCs in my campaign literally just destroyed the Darkhold and everyone in it.