WB appear to be testing out their Smash Bros Multiversus Game

Third-Party Posts
Summary
It appears that Warner Bros. is teasing its upcoming Super Smash Bros. style fighting game, which leaked a few weeks ago.
Reportedly called ‘Warner Bros Multiversus’, the game will apparently feature characters from across many Warner Bros. shows and movies. In a move that seems to hint at this, the official Twitter accounts for Looney Tunes and Tom & Jerry have posted images with their characters missing from the scene, as if transported away to another universe. Another universe where they will presumably beat each other up.
- Source: IGN
- November 19, 2021