YouTube user 開封戦隊ショウカイジャーJP posted videos coming from the Doubutsu Sentai Zyuohger press conference, which features the demonstration of the DX Zyuoh King in action!
As seen in the clip above, we see Cube Eagle, Cube Shark, and Cube Lion in their cube forms stacked together. For these cubes to transform into Zyuoh King, a giant sword is pierced in a middle, transforming the cubes into Zyuoh King. Turning the sword in the middle will unveil the mecha's face and a tiny sword.
Seen above is how the Cube Animals transform into their respective mecha animal forms, which is similar to how Shinkenger's Origami transform into their own respective animal modes. The Animal Combination DX Zyuoh King is set for an early February release in Japan.