The full game and metadata has now been uploaded to the Nintendo eShop, has a release date for tomorrow. Looks like it only includes the Battle Royale mode.
eShop description said:Jump in to be the last one standing in the free 100-player Battle Royale. Build huge forts. Outwit your opponents. Earn your Victory. Squad up together online with friends in the same room or around the world!
BUILD & DESTROY - Shape the battlefield by building your own cover. Opponent hiding behind a wall? Take out their cover to get the edge.
GEAR UP - Board the battle bus and drop in on your favorite zone. Gather resources, collect gear, and battle your opponents!
SQUAD UP WITH FRIENDS - Team up online with your friends around the world or in the same room!
WEEKLY UPDATES & EVENTS - Updates constantly fuel the fun with new gameplay modes, outfits, weapons and items.
Powered by Unreal Engine 4.
The game doesn't have the usual "online multiplayer will be free until the Nintendo Switch Online service launches in 2018" disclaimer so it seems like you won't need to be subscribed to Switch Online to play.
eShop screenshots / artwork:
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