Nintendo sent out the following

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The battle rages and the Great Calamity descends – clash with Ganon’s forces and expand your quest to save Hyrule with newly playable characters, additional stages and more!
Guardian of Remembrance, the second wave of Expansion Pass DLC*, is now available for the Hyrule Warriors: Age of Calamity game for the Nintendo Switch family of systems. Uncover more of the untold story of the Great Calamity across new battles set 100 years before the Legend of Zelda: Breath of the Wild game.
Witness the emotional backstory of the Champions and the mysterious Guardian, and overcome new threats as you continue your fight for Hyrule’s future. For the first time, play as Purah and Robbie, the quirky duo that originated in The Legend of Zelda: Breath of the Wild, and wield their array of ancient technology on the field of battle. Explore iconic locales like the Coliseum and Kakariko Village in new story stages.
The Hyrule Warriors: Age of Calamity Expansion Pass DLC is available now for $19.99, and will grant access to both Wave 1: Pulse of the Ancients, as well as Wave 2: Guardian of Remembrance. Wave 1 features challenging enemies, the playable Battle-Tested Guardian character and added weapon types, like the Flail for Link and the Master Cycle for Zelda. Wave 2 introduces Purah and Robbie, new story sequences, stages and another playable character. Who is it? You’ll have to play to find out.
Turn back the clock as you turn the tide of battle!

 

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See the launch trailer here