For those that don’t want to watch a 25 minute preview, here is a bullet point break down of the stuff in the game from the Direct:
http://www.nintendojo.com/news/animal-crossing-direct-roundup
One of my favorite things was seeing that not only can you select an island to start on, but there are other islands to explore via charter plane during the game, and you can eventually get the ability to make landscape changes to the island, from building bridges and footpaths to carving the land out like this player does to make a cool little waterfall.
I think since this is dropping the same day as Doom Eternal, I may grab both just to have a way to relax after an hour at a time of Doom. Seems like a good counter point.