At present, leakers cannot agree on whether Lü Yan or Bình Lão Lão will be the 5-star character debuting in patch 4.4 - miHoYo may also be undecided. However, Lü Yan's skill set appears more polished, with some initial details already leaked.

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Specifically, according to some leakers, Shenhe and Ganyu's foster mother, a Wind-element healer with the ability to wield artifacts, is said to be the upgrade of Kuki. It's rumored that Lü Yan might even have the ability to fly - quite plausible given that the original form of this celestial being is a white stork.
Mytour believes that Lü Yan's utilization of artifacts will make this character extremely valuable in any team composition. This is because Genshin Impact features two incredibly powerful artifacts, Pale Flame and Dragon's Bane, which provide additional effects for characters capable of wielding them.

Furthermore, Mytour has also learned that in version 4.3 of Genshin Impact, miHoYo plans to introduce 2 new artifact sets. One set is 'designed for characters utilizing Crystallize reactions to deal damage,' while the other set provides buffs when healing exceeds a certain threshold. The first artifact set is likely intended for Navia, as she belongs to the Dendro element, while the second appears to be designated for Lü Yan.