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.