This update has convinced me more than ever that there is more DLC/season coming, and I was a huge skeptic. Why put this much work in at the very end?
I can confirm no more content DLC or Seasons are planned. However, as announced, we're still planning more Cosmetic DLC next year.
The rework of the construction menu has been something that several members of the team had on their "we want to do this" list for a while already, and were very happy to be able to realize it now for the last update.