Anyone can post in this thread to talk about their new, upcoming game (or even an old, existing one) with screenshots, links, a synopsis, feature list, etc. You can even put a recruitment list in your post.
No particular content is required, since it's up to any person how well they hype their game and no concern of ours.
Replies can be any nice thing you want to say about a game or just hyping your own game. Some rules are you can't post your game more than once within 30 posts. You cannot slander games here either. You should stick to advertising your own games, and not a stranger's or we may get multiple posts for the same game.
It should be pretty obvious courtesy though not to spam the topic with your game and is obviously not tolerable. These are pretty much common sense rules.