Baseless speculation on some of the cards that have been revealed so far.
Changeling - maybe something like BoM or Overlord where it imitates stuff, or maybe something along the lines of "choose three" from a long list of options?
Cobbler - Forge lite, somehow? or a remodeler?
Crypt - probably a sifter
Cursed Village - maybe something like "+2 Actions +1 Card; you may gain a Curse for [more benefits]"?
Exorcist - a trasher, maybe? or a Reaction? maybe something Death Cart-style along the lines of "Trash a Curse from your hand; if you did, +$5", that might even induce you to buy Curses?
Ghost Town - I'd like to think this is a Village that involves topdecking somehow, since there's a general theme that ghosts scare cards from your hand back onto your deck. so maybe
+2 Actions +2 Cards, topdeck a card.
Guardian - probably a Reaction, maybe something like Lighthouse (does Nocturne have Durations?)
Leprechaun - this had better be a Gold gainer.
Monastery - trasher?
Necromancer - this is a Dark Ages sequel, so this probably gains cards from the trash. Or maybe there's a non-supply pile of Zombies or something that it gains you.
Night Watchman - maybe this is a Reaction, maybe this is something you play in your Night phase to give you protection from attacks? who knows
Raider - "each opponent reveals their hand; for each opponent, choose a card costing between $3 and $6 and gain a copy of it".
Sacred Grove - probably alt-VP. a cool mechanic would be something like "every time you trash a card, take a Sacred Grove token; your Sacred Grove is worth 1 for every 4 Sacred Grove tokens you have" or something. it'd have to have on-gain trashing, though, to pull that off without making it completely and utterly dead sometimes.
Secret Cave - maybe something along the lines of "put a card from your hand on your Secret Cave mat, or pick up your Secret Cave mat / take a card off your Secret Cave mat".
Shepherd - I really hope there's a non-supply pile of Sheep.
Tracker - deck inspector? this sounds awfully similar to Scout; perhaps an improved Scout much like Noble Brigand was an improved Thief?
Werewolf - I bet it's like "each other player may reveal a Silver, otherwise they [get attacked]".
I think that Blessed Village and Cursed Village are going to be two cards which take up one "Kingdom slot", kind of how Young Witch comes with a Bane, wherein you include both of them and that pushes the number of piles to 11. They'll probably just be both vanilla villages, except if you played a Cursed and not a Blessed that turn, it hurts you (maybe "gain a Curse", or you get a Hex, whatever those are), and if you played a Blessed and not a Cursed that turn, it helps your opponents (maybe they gain a Silver, or draw an extra card for their next hand, or get a Boon, whatever those are). So, you're going to want to balance them. Now, I'm probably completely wrong, but this is a fun idea.