- Non-Linear Geometry Types http://www.geopackage.org/spec/#extension_geometry_types
- Aspatial data - Tables/views without a geometry column http://www.gdal.org/geopackage_aspatial.html
- Point cloud data http://www.slideshare.net/mpgx/geo-package-pointclouds
- Feature Tile Link and Geometry Index (NGA) http://ngageoint.github.io/GeoPackage/docs/extensions/
- Tiled Gridded Elevation Data Extension (Draft) https://github.com/opengeospatial/geopackage-elevation/blob/master/spec/index.adoc
FOSS4G 2016 http://2016.foss4g.org/talks.html#125