I missed this earlier, but the contest parts actually show some new/higher res minisprites for mons and they look pretty good. I think Pikachu's is completely new or possibly based on its LGPE partner minisprite.
Here's direct screenshots from the website (
features tab).
If you didn't open the spoiler, I noticed Piplup has Water Gun now which is new.
The features tab also mentions some interesting points like you can get Seals (or Stickers as they call them now) by beating gym leaders and you can also edit them in the original 2D style. Following pokemon are unlocked later, probably around Amity Square.
This page is actually pretty eye-opening. We have a glimpse of the battle UI, though in Japanese. I like the colours but I think they could have just removed the bag option like how the other games do it iirc.
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There's a global and local room aspect.
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Here on the summary screen we can see that (I'm assuming) BDSP has its own mark like the pentagon, and the game is keeping the modern 6 digit IDs. I think that Normal type icon is new as well. Also, Bidoof is mentioned as Pokedex No. 399 which is its NATIONAL specification. In another scrolling screenshot Bidoof is shown to be #13 so I think this confirms National Dex numberings will be acknowledged in some form.
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I thought this was a pretty plain entry, but it's the exact same as the original Diamond.