The release of EtherCAT Slave Firmware V5.3 is significantly delayed.
New product release is planned for end of July 2021.

New features in ECS V5.3

A pre-relase firmware, wich includes SoE, is available on request. However AoE, VoE are not supported by the pre-release firmware.

The delay is not caused by priority shifting, but by unexpected, unplanned additional development efforts. Thus an improved, earlier release date is not achievable.