Itto and Gorou are characters that most players are familiar with, thanks to their past appearances. In light of the Genshin Impact 2.3 Special Program livestream, we can finally confirm the banner schedule for these upcoming characters.
Additionally, Albedo and Eula will be playable characters through Event Wish banners. We also know in what order these characters will appear in their replays in Genshin Impact for which we have outlined below.
Genshin Impact 2.3. update: event wishes preview events

miHoYo will be doing something new and interesting for the upcoming Event Wish Preview events. In Phase 1, players will see two characters running simultaneously during character banner events.
Albedo will appear in his character event wish event, "Secretum Secretorum", while Eula will be featured in the character event wish event, "Born of Ocean Swell". Both events will run simultaneously in the first phase of Event Wish Preview events.

The second phase will see the newly added character, Arataki Itto, appear in his separate character banner event, "Oni's Royale". Similarly, Gorou will also appear in Itto's banner event, for which he will receive a massive drop rate boost.
As we know the order of these character banner events will play out, the dates for these events have yet to be confirmed.
- Read more: Genshin Impact Gorou: Release Date, Voice Actor, Featured Banner, and More
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Image courtesy of miHoYo.