Ubisoft is hosting what it calls an 'Assassin's Creed Celebration Livestream', which begins at 9AM PT / 12PM ET / 5PM BST / 6PM CET (that's half an hour from the posting of this article). We don't know how long it's going to run, or what's going to be shown, which makes this whole thing a bit of a gamble!
Still, we don't think that Ubisoft would promote a standard community livestream to this extent, so we assume that there'll be some news on the future of Assassin's Creed here. It could just be the reveal of a new content roadmap for Assassin's Creed Valhalla (which is surely approaching the end of its support cycle), or we might get a teaser for the series' next game. Or both!