Hearthpwn

While I am not so excited about the overall power level of the new expansion, I believe DH got some interesting cards that could create some new viable archetypes beyond Soul DH:

1) Low curve Aggro DH can make a comeback and possibly be competitive thanks to extremely good card draw. Not the most exciting deck, but a viable alternative to Hunter and Stealth Rogue decks: 

Ultra Low Curve Aggro DH Aggro DH Deck by SirJohn13 - Nov 12, 2020 View Deck String Export to BBCode Export to Cockatrice Export to MarkDown Export to Html Clone this deck
Minion (18) 2x Stiltstepper 2x Voracious Reader 2x Amani Berserker 2x Battlefiend 2x Beaming Sidekick 2x Blazing Battlemage 2x Bonechewer Brawler 2x Guardian Augmerchant 2x Satyr Overseer	Ability (9) 2x Demon Companion 2x Acrobatics 2x Chaos Strike 1x Consume Magic 2x Twin Slice	Weapon (3) 1x Dreadlord's Bite 2x Umberwing
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2) Il'gynoth Combo DH: I really want to make Il'gynoth work in a combo deck so here is my attempt: 

Il'Gynoth OTK Combo DH Deck by SirJohn13 - Nov 12, 2020 View Deck String Export to BBCode Export to Cockatrice Export to MarkDown Export to Html Clone this deck
Minion (6) 1x Il'gynoth 2x Mo'arg Artificer 1x Raging Felscreamer 2x Manafeeder Panthara	Ability (22) 2x Eye Beam 1x Felosophy 2x Blade Dance 2x Skull of Gul'dan 2x Throw Glaive 1x Acrobatics 1x Chaos Nova 2x Chaos Strike 1x Consume Magic 2x Double Jump 2x Immolation Aura 2x Spectral Sight 2x Twin Slice	Weapon (2) 2x Aldrachi Warblades
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Idea is to draw through your deck and play Il'gynoth, 2 (or 3) Mo'args and double Eye Beam on the combo turn, possibly together with a hit from Aldrachi for a ton of damage