So, looks like we finally know what's that mysterious feature teased on Twitter (and is meant to provide a seamless experience)... They're data packs you can download on the Nintendo eShop, that can improve loading times if you're using the disc version. And yeah, they're totally free.
There's several packs:
- Basic Pack (2GB): for basic data
- Enemy Data Pack (2.7GB): for enemy data. Makes loading on the field even faster.
- Player Data Pack (3.6GB): for player data (armor, etc.). Makes loading time faster when changing equipment in shops.
- Doll Data Pack (1.7GB): for Doll data. Makes deployment of Dolls much faster.
The first pack is required if you're planning to download the other packs. You can combine them if you want/have enough space on your HDD. If you buy the digital version, you don't need any of these packs (obviously).
Source
There's several packs:
- Basic Pack (2GB): for basic data
- Enemy Data Pack (2.7GB): for enemy data. Makes loading on the field even faster.
- Player Data Pack (3.6GB): for player data (armor, etc.). Makes loading time faster when changing equipment in shops.
- Doll Data Pack (1.7GB): for Doll data. Makes deployment of Dolls much faster.
The first pack is required if you're planning to download the other packs. You can combine them if you want/have enough space on your HDD. If you buy the digital version, you don't need any of these packs (obviously).
Source