The trailer doesn't reveal much about the game, but it appears as though it won't stray too far from its roots. Hellblade: Senua's Sacrifice told the tale of a Celtic warrior battling Viking-esque undead in a dark and gloomy world, but it also took on the challenge of portraying mental health struggles in a sensitive and effective manner. Overall, it did a pretty good job in that regard.
It's a little surprising that a game built around that single, well-contained concept would get a sequel, but given how well it was handled the first time around I'd give Ninja Theory pretty good odds of pulling it off. Using it as the premiere game for a new Xbox sends a very strong signal that Microsoft believes in it, too. There's no sign of a release date yet, but we'll keep you posted.