Death Domain Cleric is my jam. I'm interested to see what comes from it. The 3! additional cantrips seems interesting and then of course there's a question about what other Necrotic based spells they will have access to.

Hexblade Warlock seems interesting. I wonder how it will turn out. Especially if doing the classic 7 Oathbreaker/5 Warlock split so having Aura of Hate (Which could benefit the summoned soul), triple attack and double dip CHR

Bladesinger Wizard is always fun. So I'll definitely give that a go.

As for other options:

Path of the Giants Barbarian could be interesting. It's just a matter of exactly how useful it ends up being. I know I've tried Throwbarian before but even with Tavern Brawler it sucked. However, it was still incredibly fun to be picking up enemies and smashing them into each other (And/or AoE's) so if the balancing is there to make using enemies as weapons actually viable this will be an incredibly fun subclass.

Arcane Archer Fighter sounds promising. I wonder how it'll fare compared to Throw builds.

Circle of the Stars Druid sounds interesting. Though I can't help but feel it will overshadow Land and Spores...

Other subclasses sound kind of meh from the descriptions... Will have to have a looksee what their actual features are before messing around with them.

Outside of that, I'm hoping they add in some more items to supplement these additional subclasses. Such as more Necrotic damage synergy items (Especially notable for Cleric given they're going to have to compete against their Radiant synergies) which could also double up in helping Spore Druids.