Recent updates by a credible Genshin impact leaker have revealed that update 2.4 might bring two brand new elemental reactions. Genshin Impact update 2.4 should arrive around January 5.
There is a total of seven different elements in Genshin Impact, all of which are attached to the game's character, except one. We are yet to see a playable Dendro element user in the world of Teyvat.
A recent tweet by a credible Genshin Impact reveals that update 2.4 might bring two new Elemental Reaction - Overgrown and Intensified. So far there is no confirmation which elements will trigger those reactions but most players predict that both will include the Dendro element.
So far the only elemental reaction that includes Dendro is Burning. The grass is considered a Dendro object and will spread the burn effect around the area. The fact that this element only interacts with Pyro might be one of the reasons why we haven't seen a Dendro character yet. It would surely require a major change to the elemental reaction fighting mechanics of the game.
Dendro is heavily tied with the region of Chasm which is already present on the current in-game map, southwest of Liyue. Chasm will most likely bring two new characters Yaoyao and Baizhu. Back in November 2020, a credible leaker by the name Zeniet has tweeted a picture featuring eight character models. So far seven of these characters have been introduced to the game with Yaoyao being the only exception.
Even though she's many fans expect her to be a five-star character considering that she will most likely be the first Dendro character in the game, many leaks are confirming that she will be a four-star, obtainable through quests just like the starting six also known as the free-to-play characters. It would make sense since the game gave us a free character of each element.