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
From the side of the Messanger, it could implement stories from pixelfed and communities from Lemmy/mastodon/kbin etc.
I don’t know if anyone is asking for this, but Whatsapp has both, so someone must be using them, right?
As from the side of every other fediverse app, I think it could be a good way of implementing DM functionality without developing and maintaining it for every single app. Maybe. I don’t know really, depends on how it’s developed/implemented