The Polar Expert Group of the European Commission has published the 3rd of it's "User Requirements for a Copernicus Polar Observing System" reports. This report, subtitled "Phase 3 Report - Towards Operational Products and Services", incorporates recommendations from the KEPLER project led by MET.
The PDF of the report can be downloaded at from https://www.copernicus.eu/sites/default/files/DEFIS_Copernicus_Polar_report_210414_HV-NC-29-144-EN-N.pdf.