SpongeBob SquarePants: Battle for Bikini Bottom Rehydrated is playable at PAX East 2020, though its the same demo carried over from Gamescom 2019. However, a separate press-only version has been spotted, which has the horde mode playable for the first time.
Source: N4G PC SpongeBob SquarePants: Battle for Bikini Bottom – Rehydrated multiplayer details revealed