According to the page, the game will eat up 3.8GB of memory, and supports up to four players either online or offline local. However, the page also lists local wireless and online play as for 2-8 players. The game will also support save data backups with Nintendo Switch Online.
As for preorder bonuses, the panda cyborg Hungry Beast will get two extra T-shirt options, and there is another T-shirt skin that features Bill and Lance as well as the Contra logo on it.
Contra: Rogue Corps releases for Nintendo Switch, PlayStation 4, Xbox One, and PC on September 24, 2019. You can read through our demo playtest here.