I kind of hope she doesn't release an unreleased collection until she's done with her recording career, as a treat for fans. I think regardless of track list, versions of the tracks we get on the release, the way she promotes and acknowledges the project and even the artwork, not a single person would be happy (as usual, but even moreso). I think the more we ask for this type of release, the more likely she is to pull more Blue Banisters-esque behaviour of throwing things out sloppily because fans won't shut up.
The whole releasing a few unreleased here and there as droplets ala Say Yes to Heaven is reasonably okay for me, but it should only be for exceptional circumstances. The only other two I'd be really here for based on their noteriety on social media and amongst non-stans is Queen of Disaster and the demo version of National Anthem.