Post Derby Thoughts:
Gonna echo and build off of some of the points in
xmarsh 's post as he beat me to it. DUU is in a great spot right now, and I think there is a lot of flexibility in building and room for it to continue to be innovated. Banning overbearing pieces like Moltres-G and Okidogi (and Espathra) have helped to diversify roles of Dark types and setup options.
Basculegion-F 
Let's get the fish shaped elephant out of the room first. I've been a starch proponent of Basculegion-F being banned for over a year now, and while the tier has changed and evolved over time adapting to it being in and out of the meta, I think it does more harm to the metagame than it does good. While dark types are naturally good in this tier (Brute Bonnet, Iron Jugulis, Hydreigon, Scrafty, and formerly Moltres-G), Basculegion puts immense pressure on the builder, often forcing pokemon like Necrozma or Volcanion to run tera normal as a check to not be completely reversed by last respects. Basculegion is unhealthy for the metagame and I would be in support of a second suspect test, now that we've seen the metagame evolve more since the initial vote and key pokemon that helped to keep it in check like Moltres-G and Okidogi have risen to DOU.
The Biggest Winners
Volcanion 
I feel slightly differently about the winners post meta shifts. I think the biggest winner is Volcanion. It was already a very driving force and glue-piece, but with removal of basculegion checks, Volcanion becomes one of the best checks to it with tera normal, and forcing damage trades with a majority of the metagame.
Iron Crown and Necrozma 
Even though psyspam's partner in Okidogi is gone, I think that psyspam, as well as psychics that can be solo benefit hugely from shifts. Sets like AV Iron Crown and Meteor Beam Necrozma have a good place in the metagame currently, especially on Jugulis teams.
Great Tusk 
This mon is something that in the past I always felt was lacking due to the presence of Moltres-G, with it gone, Tusk is free to run dual stabs without the need to run moves that do more damage into molt (head smash). Strong Ground type damage is lacking, and Tusk fills that role.
Baxcalibur 
My favorite winner of the new meta, bax is insane on screens, tailwind offense, and fits on a lot of other structures. With scrafty being the only semi-regular intimidate in the tier, loaded dice and assault vest are freed up and allow coaching cores to really catapult this mon into being a top tier meta threat.
Basculegion-F 
Already yapped about this girl, ban legion.
Closing Thoughts
With the introduction of champions, DUU's place in DPL may not happen, but I think that if it does the meta is in a really good place, aside from legion. I'd like to see another suspect vote on it prior to DPL.