Hoo-boy, lot of stuff. Both versions get access to some amazing stuff, but I think Midday forme may make Sun a bit better for us VGC players, since you can always trade for the Orangutan. Also, is it me, or is this update for the VGC players?
Lycanroc - Meh name, but I'm sure a lot of people already had names picked out so who cares? (Personally: Horo for Midday, Moon Moon for Midnight) and right off the bat we can kinda see that Midday has gotten a ton of breaks: Priority Rock Move and Sand Rush means it'll fit into Sand Teams pretty nicely unless the stats are garbage. Midnight Lycanroc gets an appropriate ability (Vital Spirit, can't fall asleep) so that's amusing at least. I wonder if it'll hit harder. We will have to see, but Midday Lycanroc is looking pretty good.
Passimin - So it is true... Interesante. Handegg Monkey probably won't take the Singles meta by storm (unless the stats and movepool are both pretty good) but the ability would make for interesting company on some Doubles teams. Although worst case scenario is on niche teams like PerishTrap where it can hope to copy Shadow Tag. But taking an ally's ability when it faints is pretty dang useful, so I don't see the worst case happening: you can reset weather, get a second intimidate, get Parental Bond, or several other useful abilities like type immunities, speed boost, ect. It also has potential.
Oranguru:
DOES INSTRUCT WORK ON Z-MOVES??? So, Instruct is a pretty amazing move and the typing is interesting. Definitely designed to get people using Spread moves more, and it would probably work... Although teams that rely mostly on spread moves may still be kind of Gimmicky, especially if Oranguru has low speed. Smeargle with Instruct would be interesting, but I wonder where it would fit the move. Pretty sure someone would find a way... But i kinda think Oranguru would have much better stats than Picasso Doge.
New Z-moves: Proof that you don't have to use a Z-move that is exclusive to a Pokemon... Although I reckon Catastropika may be arguably better than Gigavolt Havoc. And status move Z-moves confirmed.
I recall someone joked about a 100% freeze move.
...that might not be a joke now.
If i wasn't at work on my phone, as the person who brought that up as a kinda serious idea, i would insert a gif or video of Dr. Evil's laugh right here. :P watch it be an exclusive Z-move though. Maybe lower distribution would help balance it?
Anyways, Extreme Evoboost (why not Extreme Eeveeboost?) has the best Z-move animation thus far. And +2 to all stats spells "I am Instantly Banned in LC." Which means competitively it probably won't see much use since at the end of the day you have to nab the +2 to everything without Focus Sash. Sure you can try to use Rage Powder in doubles, but Spread Moves may take it out regardless.
That said, if your opponent lets you Successfully Instruct an Eevee to Extreme Evoboost twice... They should just forfeit out of shame. (Although with Trick Room... It could actually work.)
Others: Customization has its own currency? Wonder how well that'll work. Females having more clothing options than males doesn't surprise me. It didn't for XY, so i expected that. Not surprised at Pokebank disallowing tradebacks. Gen 1 to Gen 2 didn't, Gen 3 to Gen 4 didn't either, so it doesn't seem strange. Makes me wonder a bit how Pokebank will handle having Pokemon in multiple generations though. Maybe that is why they had to delay it?