I said when Microsoft pursued this, discord would be a massive get. I also remember the tweet about hack week that hinted api integration and Microsoft might be working closer together here:
I think this goes beyond simple presence and account linking, purely because of the time frames we're talking about. I think this is also hinted at here:
Together, our teams are already hard at work connecting Discord with your social and gaming experience on PlayStation Network. Our goal is to bring the Discord and PlayStation experiences closer together on console and mobile starting early next year, allowing friends, groups, and communities to hang out, have fun, and communicate more easily while playing games together.
To bring these experiences to life for our players, Sony Interactive Entertainment has made a minority investment as part of Discord’s Series H round.
It sounds as though Sony have approached Discord with a view to developing custom api's and they've been asked to stump up cash or incentivise. Obviously being a partner gets you a seat at the table and an input albeit minority) on future features, priority votes and enhancement requests. Bearing in mind, the custom bots you can program in Discord already via existing api's (like D2 for example) makes me think the bulk on the development here is on the Discord side (coupled with the lead time).
What it looks like is anyone's guess at the moment. Game base is pretty much not working how it's intended so I can see them moving all those features into discord which means Discord would need to integrate with the trusted api's for game invites etc. There will probably be a Sony skin on the top of it front end, and on the mobile app. It also aligns with all the web tech they've been changing to like the store etc. using APIs