There are some quality of life stuff you should maybe look into. For example when opening a chest there is a button to the side that lets you put only the copies of the stuff you have in your inventory into the chest. Example: If you have 1 stone, wood, sap, clay in your inventory and you open a chest that already has stone, wood, and clay and press that button, then the stone wood and clay from your inventory would go into the chest and you'd still have the sap in your inventory because it wasn't already in the chest.
Robin now has a telephone for sale. That has some useful features (and some unique ones too). If you're the type to buy the calendar from her I also recommend getting it.
You can also now check the Community Center bundles from anywhere. And when you get an item you still need for the CC. It'll pulse the CC icon when you hover over it in inventory.
Most other things are similar enough it doesn't matter too much, or you should experience for yourself. Some price changes and weapon balance things etc.