Got a lot of new (as in I don't think it's been mentioned here before) information today via tumblr (mainly a user called "pelshko"):
1. Fish (and I'm assuming insects and sea creatures) can now be kept in storage (dressers, drawers, etc.)
2.
View attachment 1970 It appears that Saharah now comes into your house to give you carpet and wallpaper. Maybe she assesses your room and picks something that may match? I'm not sure.
3.
View attachment 1971 Animals, in addition to doing things such as shaking trees and fishing, can also "read" the bulletin board.
4.
View attachment 1972 This appears to be what looks like the inside of an igloo? So maybe those return as well as the camping animals.
Also, I found a lot of interesting tidbits
here. Some that I don't think have been mentioned here:
1. Your house can be lit without the use of a candle, lamp, etc. There is a light switch button on the touch screen.
2. One new rock will appear each day that can be hit in exchange for a gem.
3. You can now donate things/check multiple fossils at once at the museum, instead of doing each one by itself. Also, once you donate something, you will not be able to select it from your inventory for donation again. This is handy as it'll save you the time and trouble of checking to see what is/isn't already donated.
4. The animals can also display items which you can buy at R. Parker's for ridiculously low prices.
5. Kicks' shop is apparently unlocked after spending 8,000 bells at Able Sisters.
All right, that's it. I hope none of that has already been mentioned.