I was concerned when the IP was sold to Gearbox, but if this is how they handle announcing a new DLC I'm not as concerned anymore.
Shame that this will upend the small modding community, but holy shit this is exactly how you nail the game's style. The modding community will catch up.
Each of those screenshots feature what looks like a constellation in the sky of Petrichor that wasn't there before. We've wrapped up the tale of the two brothers, but we've barely touched the surface of the void despite the DLC themed about it. I wonder what the hell this DLC will be themed around.
They also just released a patch today. The announcement is just a ton of the meteor emoji.
Can't confirm if the constellation is in game with this patch yet. Also of note, the glyphs on the DLC page don't match any symbols seen in universe so far.
The announcement will likely be this Wednesday during Gearbox's "Festival of Gup" thing they're doing on their Twitch to celebrate the RoR community.
This Wednesday is also the release of the Risk of Rain 1 Remake, so maybe a secret for longer.
The transmission ID on DLC steampage is an alphabet cypher that translates to "A signal from deep within"
And others are saying the constellations or sparkly things are in game as of the patch today.