Not Gamescom-related, but there was a Nintendo Direct that showed off some indie/partner games on the 27th, and a CoD thing today (the 28th), if either of those were what you were thinking of?
Only other thing that comes to mind is maybe the Future Games Show, but that was last week (list of trailers here).
Iirc from my time on kbin, posts are for the “microblog” part, i.e. the part that interacts with mastodon.