No doubt in my mind that kingambit is the most pressing issue in the tier. The ease of using screens post-dlc is lowkey a huge buff for kingambit.
ursaluna-bm is next up in my opinion. I’ve been using a semi-spdef scizor to kiiiinda take a hit or two and try to CC back. It’s not a good defense against Luna lol, but pretty sure nothing really is.
waterpon & manaphy are good but a little team preparation goes a long way to avoid being wrecked by them. Not worried about gholdengo or Iron Valiant at this time.
ursaluna-bm is next up in my opinion. I’ve been using a semi-spdef scizor to kiiiinda take a hit or two and try to CC back. It’s not a good defense against Luna lol, but pretty sure nothing really is.
waterpon & manaphy are good but a little team preparation goes a long way to avoid being wrecked by them. Not worried about gholdengo or Iron Valiant at this time.
Manaphy. Featuring a status healing Calm Mind. Who thought this was a good idea? But seriously I don't think anything can stand up to his thing.
With Dracovish gone we have... a lesser Dracovish. I never thought I'd see the day of STAB Ludicolo coverage being oppressive, but here we are.
I do think the meta is in a tenable position for the next two or three months, but if we have to test anything Blood Moon is probably my first target. It's so fat and can crush balance and stall on its own. Unlike other stall breakers though, it feels like it can more consistently go 1 for 1 against aggro, making it not dead weight there. I don't think its impossible to keep this OU however. It does have positive qualities I like for the meta, namely how bulky it ends up being. CM just feels like a solid mon to throw on teams to help ease the pains of builder rn. Obviously it makes some of those pains worse in its own right, but I don't know if I would vote ban on it.
Gambit is still the best one size fits all wincon in the meta. Nothing has changed on that front. I'd prefer to do a Gambit suspect in Wave 2, especially if we do a soft reset for the Indigo Disk meta. It's a bit of a necessary evil at the moment. 
I am lumping these two together because they are part of the same problem. Gliscor imo is the tipping point where the hazards meta feels completely borked. Its such a fat pokemon that has so much utility that sets up hazards so easily. IMO, the problem with Hazards rn isnt the lack of removers, its Gholdengo. The stupid string cheese warps the hazards meta around itself and is so goddamn gross. I know testing Ghold would be a huge undertaking right now and would certainly be a major shift, but I feel it would do a great job of preparing us for the Indigo Disk. I do not want Ghold's influence on the hazard game looming over the next meta as well, skating by as we deal with more pressing matters like Tera. 
Honestly, Valiant is fine and easily the mon rn I have the least of an issue with. I think its presence in the tier is just a positive one as a whole. 
Veil is so annoying and I am worried about how it will affect things in the Indigo Disk and forward. It enables so many sweepers to become super toxic. I'd be open to testing Alolan Ninetales right now, but I also kind of like the niche it adds to the meta. Veil Offense adds another flavor of weather to the tier and a whole teamstyle that makes the tier more diverse. I like how we have many different playable offensive team styles. Veil, Weatherless, Sun, Rain, BO, heck Trick Room even works. I like that diversity and I think A Tales adds to the tier more than say, Blood Moon. 
Maybe if the tier settles down further, we test these? At least test Darkrai after we resolve Tera. Or drop both if we do a bit of a soft reset with The Indigo Disk? I can dream