A new Genshin Impact 3.5 leak by Tao suggests that Dehya will appear on one of the first banners in the upcoming update. It is subject to change. Assuming this is true, then that would mean that Dehya should have a release date of around March 1, 2023.
HoYoverse hasn't yet confirmed when Genshin Impact 3.5 will start. That said, most Version Updates tend to last for 42 days. If Version 3.4 began on January 18, 2023, then 42 days later would be March 1, 2023.
A banner in the first half would have the same date as the version release date.
There is currently no news on who the accompanying 4-star characters will be. Most importantly, there isn't any news on whether Mika will be on the same Event Wish or if he will instead be summonable in the second half. On a similar note, there is no news if Dehya will be the only 5-star character in this phase of Event Wishes or if there will be a rerun alongside her.
Dehya's 5-star Claymore, Beacon of the Reed Sea, should be on the first Epitome Invocation if this leak is accurate. Since the other 5-star character rerun is currently unknown, there is no information on the remaining 5-star weapon of that banner.
The same leaker from the previous leak also received another unverified report regarding some potential reruns. It's far too early to determine its legitimacy, but the current rerun rumors point to Cyno, Eula, and Albedo returning.
Just for reference, here are the last times these 5-star characters were featured:
There is no guarantee that this rerun rumor is accurate at the moment. Genshin Impact 3.5 is due to launch around March 1, 2023, whereas this leak was released around late January 2023. Typically, reruns are only discovered a week or so before an update comes out.
Thus,
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