It will premiere this year

Sega ahs opened a website for a new anime adaptation based on their MMORPG series “Phantasy Star Online 2", which you can see bellow:

The story, unlike the original anime “Phantasy Star Online 2: The Animation” will cover the game´s story, especifically the chapters 1 to 3.

The staff and cast are still unknown.

Via: Anime News Network