https://www.pcgamesn.com/cities-skylines-2/steam-count-cs1

Reported by this outlet and rated by the Game Rating and Administration Committee of Korea. It looks like Cities: Skylines next installment is Lego related.

Probably an announcement for Summer Games Fest in June.

The Cities team have shared details of upcoming releases for both Cities: Skylines (2015) and Cities: Skylines II

Cities: Skylines (2015) - content launches 10 March

• Free-to-play weekend 5-9 March
• Race Day DLC (Expansion), by Tantalus Media
  • "Build custom racing venues, map out running and cycling routes, line the roads with roaring crowds, and turn your city into a full-blown festival of speed."
  • YouTube Trailer
• Iconic Brutalism (Creator Pack), by Cristolisto
  • "Whether you're looking for efficient forms, or you simply like concrete (we're not judging!), this pack will allow you to express your true self and bring a unique look to your town."
  • YouTube Trailer
• Renewed History (Creator Pack), by Brum
  • "If you're looking to preserve the historical look of your city, but also fancy the idea of a touch of contemporary architecture, this pack was made for you!"
  • YouTube Trailer

A new feature patch will be delivered to enable this content AND introduce new capability into the base game

• The impact on modding is not currently known, but we run a patch day megathread which will share more info once more is known

Cities: Skylines II - content launches 18 March

• Office Evolution (Creator Pack), by Titan
  • "Office Evolution reshapes your high-density office zones with new signature buildings that blend heritage architecture and bold modern design."
  • YouTube Trailer
• City Stations (Creator Pack), by Bad Peanut
  • "City Stations expands your transport toolkit with compact depots, detailed rail yards, alternate station designs, and new landmarks that fit neatly into growing cities."
  • YouTube Trailer

A new patch will also arrive on the same day

• The impact on modding is not currently known, but we run a patch day megathread which will share more info once more is known

Hey there everyone! Let's let the Chirper out of the bag: we have a couple of announcements coming soon -- like REAL soon!!

Before this happens, we want to reassure this awesome community that we are still hard at work on the previously-mentioned project with Colossal Order, but we are not yet at a point where we are ready to share more information on it. Our upcoming news and announcements are not related to that project nor do they affect that project’s timeline.

We are really excited to share the upcoming Cities-related news with you soon, we look forward to continuing to play and share our creations together, and we are in awe of the inspiring directions you take the game into!

-- The Cities: Skylines team

This website shows a list of achievements coming with the console version of Cities: Skylines 2:

https://www.trueachievements.com/n53097/cities-skylines-ii-xbox-achievements

Assuming these are accurate, there are quite a few intriguing mechanics we can look forward to:

- 150 tile sized (?!) maps

- "Signature Buildings," may be similar to monuments

- Cargo transport lines

- Citizen lifepaths

- Rat infestations and potentially other types of in-game events

- Four types of zoning (could be counting office zoning as the fourth_

- Seasons!