Just a few weeks into Animal Crossing: New Horizons, there's already a good chance that you've got several complete dinosaur skeletons and some lively aquariums and insect zoos at your island's museum. There's surely still plenty left to collect if you're not manipulating the game clock, but there's no art gallery in the museum like in past games. One piece of villager dialogue, though, suggests it might not stay that way.
On Twitter, a New Horizons player posted a clip of their villager Fang talking about looking at some art in the museum—totally normal talk from an Animal Crossing townie, provided there was actually an art gallery in the museum to speak of:
So far, Nintendo has not confirmed whether or not major features will be added to New Horizons with subsequent updates, but it's certainly possible. For one, there's series precedent for it: New Leaf received the free Welcome amiibo update about four years after its initial release, adding new characters and major features.
Right now, it seems that we're due for a steady stream of updates tied to limited time events in New Horizons, but the return of shifty art dealer Redd doesn't seem totally out of the question. If he does come back, maybe it'll still be tied to a holiday, giving players a small window of time to sort out the real artwork from the forgeries before donating to Blathers. All we know for sure right now is that art collecting and Redd aren't currently in the game.
Of course, it's possible that the inclusion of Fang's line about appreciating art was mistakenly included and we won't get art collecting at all. So long as New Horizons keeps the events coming, it'll likely be a long time before dedicated players get tired of what it does have... so long as there aren't more Eggs and unsavory types like Zipper T. Bunny awaiting us.