The official website for the Sword Art Online anime has revealed more details on the new Sword Art Online: Alicization – War of Underworld TV anime. They have listed the series to have eight home video releases, and will have a total of 23 episodes.
The announcement stated that the first four home video releases will be released once a month, from December 2019 until March 2020. The releases will then skip April and May, before resuming the one-a-month releases from June to September.
Manabu Ono is returning from the first part to once again direct the anime over at A-1 Pictures. Meanwhile, Gou Suzuki, Shingo Adachi, and Tomoya Nishiguchi are all credited for character designs.
source: Sword Art Online official website