Is the DLC going to be available in summer on the gog version just like on steam?

The hype is real!

It’s not DLC. It’s a standalone title
https://www.pcgamer.com/games/fps/robocop-rogue-city-is-getting-a-standalone-expansion-that-sounds-an-awful-lot-like-the-raid/

It's a DLC that's being sold as a standalone expansion pack.

Guys, I posted this a few minutes after the release of the trailer and nobody knew it was a standalone dlc, anyway: who cares? Seriously, how does that answer my question?

Someone asked this question on the Steam forum, but there's still no response.
I replied over there that it's likely the DLC will be released on GOG eventually, since the publisher, Nacon, engages with GOG frequently to put the game on sale. So, let's just cross our fingers, eyes, and toes and hope for the best. :)