User feedback (https://github.com/geonetwork/core-geonetwork/pull/2419) and additional improvements (https://github.com/geonetwork/core-geonetwork/pull/2708, https://github.com/geonetwork/core-geonetwork/pull/2712, https://github.com/geonetwork/core-geonetwork/pull/2725)
Editor / INSPIRE JRC validation
Editor / INSPIRE view improvements
XSL processing / Preview mode / Return error report.
ISO19139 / Improve feature catalogs in metadata
Map viewer / Allow to customize gazetteer
and more … see 3.4.2 issues and pull requests for full details.