First, Union Creative showed off their prototype for the Legendary Six Samurai – Shi-En figure.

Source: Union Creative Twitter

AMAKUMI also showed off a lot of their prototypes:

Their Ghost Belle & Haunted Mansion prototype was shown for the first time:

It will be 220 mm/8.66 in. tall

Source: VJump

They also showed off their Ash Blossom & Joyous Springs figure in color:

It will also be 220 mm/8.66 in. tall

Source: VJump

CG prototypes of Amabie and both Evil★Twin Ki-sikil and Evil★Twin Lil-la were also shown.

The intended scale for this prototype has not been revealed.

Source: VJump

Both Evil Twin figures are intended to be around 1/7 scale (for reference, the Ghost Girl figures previously mentioned are described as that scale).

Source: VJump

Kotobukiya also fully showed off their Sky Striker Ace – Kagari (alternate art) figure:

This figure will be 390 mm/15.4 in. tall.

Source: VJump