It appears as though the old Genshin Impact leaks of Diluc and Fischl having new skins might actually be happening.
Unfortunately, their models haven't been leaked yet; instead, it's just a credible leaker backing up the story. Chinese leaker Tz recently confirmed that Uncle DD's leak about their skins is authentic. For reference, Uncle DD stated that Diluc's skin would be similar to his KFC promotional art and that Fischl would have a costume too.
No exact dates are given in these leaks for when players can expect to see the new outfits. They were not leaked to appear in Genshin Impact 2.5, which means that fans will have to wait a while until they see the new outfits' models or artwork.
The above Reddit post contains some screenshots related to these leaks. It should be noted that they're written in Chinese, but the leakers are considered credible by the overall community. There have been a few related leaks to this topic, although it's worth noting that they don't come directly from Uncle DD.
Neither character currently has other outfits for the player to equip, so these upcoming skins will be their first ones. It's also worth mentioning that Uncle DD's initial leak on this matter stated that Noelle wouldn't be having a new outfit (she was in the KFC promotional art as well).
According to the leaks, Diluc's upcoming outfit will be "similar to his KFC costume." If those leaks are accurate, then his new skin should resemble the one he's wearing above. It won't necessarily be identical to it, but it should be similar (although how similar is up to interpretation).
No leaks are confirming what Fischl's upcoming costume will look like in Genshin Impact. At the moment, all Travelers can do is speculate on potential ideas. It
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