It will be open source, end to end encrypted using Signal’s double ratchet encryption protocol, and he plans to make it easy for fediverse platforms to integrate it. The beta will release later this month.
He’s also the creator of https://fedidb.org btw
Presumably because currently, activitypub doesn’t have a module for secure message exchange that can’t be snooped on by a server admin.
Not but there are 7369543 other “modules” you can already use.