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That's just an announcement of something. The practice dates way, way back- like, 1800s publishers getting an author to commit to writing the next entry in a series just so they could start hyping its planned existence in the next printing run of the current ones.
Advertising by Association for the announcement focusing on something like "from the makers of game X, game Y!" with little other information given.
Edited by Scorpion451

It's a thing fairly common in modern videogame marketing is trying to build hype with anything you've got, in this cases even if you've got little to nothing of an actual game. I'm looking for a trope in which the reveal of the game consists in the logo, maybe a background or some music or a "coming soon". Something like the reveal of Metroid Prime 4 (2017) or The Elder scrolls 6 (2018) or Gta 4 (that guy's arm in 2006). It doesn't necessarily have to do with gaming but it's most common in game reveals. Thanks for your attention