Yesterday at Anime Expo 2017, Production I.G revealed the first trailer for FLCL 2 and 3. Each season will have two completely different stories.

Originally slated for late 2017, FLCL 2  will premiere in 2018 followed by a break leading up to FLCL 3. Each season will be 6 episodes, like the original series. In Japan, both seasons will be shown theatrically as two movies instead of as a series. Additionally, a manga has been announced for FLCL 2.

According to the show’s official website, each season will have some staff changes:

FLCL 2 Staff:

• Chief Director: Katsuyuki Motohiro

• Supervisor: Kazuya Tsurumaki

• Directors: Kazuto Arai, Toshihisa Kaiya, Yuki Ogawa, Yoshihide Ibata, Kei Suezawa, Hiroshi Ikehata

• Script: Hideto Iwai

• Original Character Design: Yoshiyuki Sadamoto

• Character Design: Chikashi Kubota

• Mechanical Design: Kiyotaka Oshiyama

• Theme Song: the pillows

• Animation Production: Production I.G

FLCL 3 Staff:

• Chief Director: Katsuyuki Motohiro

• Supervisor: Kazuya Tsurumaki

• Directors: Yutaka Uemura, Kiyotaka Suzuki

• Script: Hideto Iwai

• Original Character Design: Yoshiyuki Sadamoto

• Character Design: Yūichi Takahashi

• Mechanical Design: Kiyotaka Oshiyama

• Theme Song: the pillows

• Animation Production: Production I.G, NUT, REVOROOT

The series originally premiered with a total of six episodes back in 2000.

SOURCE 1, 2