After checking the update highlights for Taiwan's most recent patch on September 4, I noticed a section underneath Ellinel Fairy Academy and Rienna Straits that listed Hyper Skills and a picture of Dragon Warrior (a.k.a. reskinned Jett).
This is a description of the Hyper Skills if anyone wants to translate it:
Link to the highlights, with animated Hyper Skills at the bottom, can be found here.
From the looks of things it seems like the attacking hyper skill is a copy of the Bucc hyper and the buff hyper skill is Epic Adventurer and probably a copy of the Sair hyper.