Initial impressions of the paradoxes just going off their stats and typing:
-Great Tusk looks kinda mid. Good physical stats and HP but everything else seems bad. Ground/Fighting is a pretty redundant typing offensively and doesn't really have much going for it defensively. 6 weaknesses to somewhat common attacking types (Grass, Ice, Water, Flying, Fairy, Psychic) means that it's probably best off using a Scarf. If it has a broad enough movepool, I could see it being a decent physical wallbreaker or setup sweeper with Rock Polish.
-Brute Bonnet looks bad. Grass/Dark is an atrocious defensive type and its stats indicate a slow bulky tank. Probably better in VGC where the Dark type adds utility due to being immune to Prankster.
-Sandy Shocks looks like it has potential. Ground/Electric is a pretty decent typing offensively and isn't too compromised defensively in the same way Ground/Fighting and Grass/Dark are. Probably doesn't have The Juice (tm) to be an OU meta staple, but if it has a good enough movepool I could see sets like Scarf be used on some teams.
-Scream Tail looks like it was made for VGC. Very fast and bulky with a workable defensive type that doesn't have too many common weaknesses. Likely not going to be good in singles but I can see it becoming a staple in VGC if it has a good enough support movepool, which base Jigglypuff definitely has in spades.
-Flutter Mane looks like it'll be a menace. Excellent offensive typing and the stats to take advantage of it. Even if it only has Ghost/Fairy STAB it'll probably be very good offensively. I can see wallbreaker sets with LO/Specs and Scarf sets being very popular.
-Slither Wing looks underwhelming. Good Attack and decent bulk, but not much else. Bug/Fighting is an interesting defensive type as we see with Buzzwole, but it worked on Buzzwole because it had excellent physical bulk to take neutral hits quite well, which Slither Wing does not have. Probably not gonna be very good.
-Roaring Moon looks menacing. Excellent stats across the board for a physical attacker and pretty good bulk, too. Dragon/Dark is a pretty vulnerable defensive type, so it might have a harder time finding opportunities to switch in/set up than the bulk would suggest, but I think it'll be potent.
-Iron Treads looks potent. Excellent typing and well-balanced stats means that a lot of sets could probably work well on it. Not really a whole lot to say here as I'd need to take a look at the movepool to see what it'd really excel at. Band looks like it'd work pretty well on it at first glance.
-Iron Moth looks spooky. Sky high special attack and decent speed means that if it gets Quiver Dance, it'll probably be the premier QD user. Again, how well it works would depend on its movepool, but it looks like it has The Juice to make at least a Specs or Scarf set work.
-Iron Hands is interesting. Unique typing that provides a lot of offensive utility and lots of bulk and power. Low speed hurts it because of common weaknesses to Fairy and Ground, but it looks like it'll be a potent wallbreaker with a Choice Band. Probably not gonna be a staple but it'll be interesting to see. Looks like it'll be a big threat in VGC on Trick Room builds.
-Iron Jugulis is... an enigma. I can't make heads or tails of it. Has a pretty well-rounded stat distribution in the vein of Sandy Shocks and the Ghost resist is definitely valuable, but this one in particular is pretty dependent on movepool. The STABs alone aren't anything to write home about and the stats aren't particularly great in any one area. If it gets Defog+Roost, I can see it being used as a sort of Mandibuzz substitute that isn't a complete momentum sink.
-Iron Thorns looks... underwhelming. The typing isn't particularly good defensively and it's pretty slow and bulky. Like Iron Jugulis, I'll have to see the movepool before I pass judgement on this one.
-Iron Bundle looks really good. Excellent offensive typing and the stats to back it up. Even if it just has STABs offensively, I can see it being a pretty good Specs/Scarf user.
-Iron Valiant looks like it'll be pretty tricky to deal with defensively. Really good offensive STAB and the attacking stats to back it up. My first instinct is that it'll use Scarf sets to be a good revenge killer, but if it has a good offensive movepool I can see Life Orb/Specs/Band sets giving defensive teams a headache.
I'm most excited for Flutter Mane, Roaring Moon, Iron Treads, Iron Bundle, and Iron Valiant.