TWIN ENGINE released the episode 4 preview for VINLAND SAGA  Season 2. The anime is currently streaming on Crunchyroll and Netflix. The upcoming episode is scheduled for January 30 and is described as: 

When one of the guests, the “Fox,” raises his sword at Thorfinn, the leader of the guests, the
“snake”, appears and rules the place. Einar sees Thorfinn’s incredible moves and learns that Thorfinn
was once a warrior. 

Key staff for episode 4 include Atsushi Kobayashi in charge of the storyboard, Yoji Sato in charge of direction, and Tsuyoshi Yoshioka, Sho Hirano, and Chiharu Mukae as animation directors. 

Kodansha USA describes the manga as:

As a child, Thorfinn sat at the feet of the great Leif Ericson and thrilled to wild tales of a land far to the west. But his youthful fantasies were shattered by a mercenary raid. Raised by the Vikings who murdered his family, Thorfinn became a terrifying warrior, forever seeking to kill the band’s leader, Askeladd, and avenge his father. Sustaining Throfinn through his ordeal are his pride in his family and his dreams of a fertile westward land, a land without war or slavery … the land Leif called Vinland. 

The returning staff for Vinland Saga Season 2 includes Shuhei Yabuta as director, Hiroshi Seko as series composer, Abiru Takahiro as character designer, Yusuke Takeda as art director, Yuki Kawashita as photography director, Satoshi Hashimoto as color designer, and Yutaka Yamada as music composer.