Flechs Command Console (formerly Flechs VIII) is what comes after Flechs Sheets.
The project goals are similar to Flechs Sheets but prioritize running higher unit counts and multiple forces, increased support for tech and units, and go deeper into passive and active play-assist.
If it releases, it will release as a separate stand-alone project.
Flechs Sheets (sheets.flechs.net) will persist as is and receive bug fixes but gain no new features.
There is no ETA for Command Console, but progress is posted regularly on ko-fi, including periodic development builds for supporters.
Preliminary docs are available here.
A project goal tree is available here.
A semi-current changelog is available here.
Progress GIFs and dev-blog links below...