Listed below are a few of the features that Yoshi-P provided in the interview:
Player owned island which will receive regular updates
Island begins as a blank canvas
You can place buildings (wording used by translator was, "You can say like, 'Okay, what kind of building do I want to place here? What type of materials do I want to gather? Okay, maybe I want to let my minions run free.'")
Tend to your animals and crops
Expand the territory on your island
Not a competition between players
No pressured / timed content
No high level weapons / gear
This is an area to relax. Also explicitly stated that "you can call over your friends to your island and have a chat with them, you can go and visit your friend's island"
There is "a focus on the house, the garden and the furniture, but you can see this as a bit of a rank higher, there's a bit more broad things in the mix"