Sorry if my translation sucks cos eng aint my native ;)

confirmed as 5th character since this upcoming patch. oh man oh man. he is gonna be my 2nd best in da game.

Rough Translation of Event (I can only give my translated version based on the text I had read as the event will only be out in 2 days time.)

Ling Xiao Tú Mí (荼靡) SSR Event "It's right to believe me."  “Rest assured, I’ll be responsible to change your boring world into a interesting one.”

 Date: 20 June 2019 to 26 June 2019 

 How to collect SSR Shards? > Click on the event Map to choose a time and location. Use the [Azure Shard] to explore. [Azure Shard] can be purchased at Evol Supply Page.  > Each map has 10 explorable sites. You may choose to either explore it one by one or all at the same time. You may select another time or redo the exploration after completing one full cycle. There is no limit to exploring. > Each exploration drops [Ancient Coin x 1]. Other possible drops include [Ling Xiao~TuMi] Shard, Coins, Confession Wish etc. 

 Mysterious Store: > [Ancient Coin] can be used to redeem the following ~ [Ling Xiao TuMi] Shard, Galaxy Coupon, 3 and 4 Star Training Book, Coins, Card Enhancement materials etc. 

 Others: > Every exploration unlock encounter story with Ling Xiao. There is a total of 6 stories to unlock. > Other than unlocking story, you will get a chance to unlock mini events with Ling Xiao. Different choice trigger different response. After completing all mini stories and choices, you will get a limited edition Avatar Frame [Azure Sea].

Evol Supply Package > TuMi Blossom Package includes [Azure Shard x 1, Ancient Coin x 150]. Maximum 10 purchase. > Clear Azure Package includes [Azure Shard x 48, Ancient Coin x 240]. Unlimited purchase > Romantic Date Package includes [Purple heart x 72]. 1 time purchase.