I wasn't aware of this, but they have an early pull request on working on #PQXDH and they also stated that they are working on:

"Ongoing futureproofing work includes Post Quantum resilience via Kyber post-quantum KEM and PQXDH key exchange, as well as support for Messaging Layer Security (MLS, RFC9420) for improved scalability for group encryption."

element.io/blog/secure-video-c…

github.com/matrix-org/vodozema…

Secure video conferencing for Matrix

79% percent of technology leaders at large organisations feel their sanctioned video conferencing tools fall short...

^{Archie W (Element Blog)}