AMSAT-DL has released their proposal about next generation GEO/MEO payload. AMSAT-DL’s proposal is written by the authors Kai Siebels, DH0SK and Matthias Bopp, DD1US. The proposal takes into account the technical requirements and needs of radio amateurs. Various aspects such as orbit, satellite and platform as well as payload are taken into account.
Please see: https://amsat-dl.org/en/the-next-generation-of-a-geo-meo-amateur-radio-payload/