in addition to a future season?
Not sure about getting a new season. Seems like the project they announced back then is this six-episode movie. Judging from the Anime Corner article, these six episodes would be slice-of-life focused. Getting new season will depend on how the production team will use these six episodes to connect to a new storyline at the end. There are a lot of they can do with just existing characters/organizations as they didn’t fully explain in the first season.
I was basing that off the translated tweet they have in the article from Chisato’s VA:
The new work is in production! In the meantime, let’s enjoy the short movies
Implying they are two separate things. I guess it doesn’t confirm it is a new season, but it is at least something separate from these 6 episodes (hopefully not something like a mobile game). Time will tell. I would love to see some more of the LilyBell organization and its history with Chisato.