Chris,
the ND filter control is definitely not working yet (posted
here, a kind of workaround is described
here).
Most of the other features work well (e.g. USB remote, scripts, Bracketing, Zebra, Histogram, RAW...), we do not have video settings yet.
The cam always starts in playback mode (have to press the shutter for record mode), CHDK only works in bootable SD Card mode (no fw-update with Canon menu, as on all DryOS cameras) - and there's the "Touch Icons Behaviour"...(see
this post).