Here are some series details, courtesy of Wikipedia:

The story of Gekiranger features two opposing sides of the same school of martial arts, the Juuken style, which allows one to control the anguish in their minds. The good form of Beast-Fist style is known as Geki Juuken Beast Arts , Geki Jūken Bīsuto Ātsu?, Fierce Beast-Fist Beast Arts) and is taught by Master Shā Fū. The evil form of the Beast-Fist style is known as Rin Juuken Akugata (Overlooking Beast-Fist Evil Style) and they are commanded by the Rin Juu Lord (Overlooking Beast Lord). To fight the opposing school, Shā Fū chooses three of his students: Jan Kandou, Ran Uzaki, and Retsu Fukami. Becoming the Gekirangers, they confront the Rin Juuken school.

Gekirangers
Jan Kandou (GekiRed)
The Unbreakable Body.
He will be represented by a red tiger.

Ran Uzaki (GekiYellow)
The Honest Heart.
She will be represented by a yellow cheetah.

Retsu Fukami (GekiBlue)
The Fantastic Technique.
He will be represented by a blue jaguar.

Allies
Juuken Teacher, Master Shā Fū
He is the mentor of the Gekirangers and is master of an unknown form of martial arts. He appears to be an aged anthropomorphic cat with large ears (very likely a caracal cat).

And here’s a breakdown of the crew that’ll be bringing it, courtesy of THE Shougo B’Stard:

Creator: Saburou Hatte

Project overseer (?): Takeyuki Suzuki (this guy produced a lot of the sentais from the good ol’ days, but lately has just slapped his name on mediocre works like Dekaranger to try and fool the old-schoolers)

Producers: Seiji Yagi (TV Asahi)
Hideaki Tsukada (Toei producer; chief producer of Dekaranger and Magiranger)
Kouichi Yada (Toei Agency)

Chief writer: Michiko Yokote (she’s written fillers for Dekaranger and Magiranger; some of her Deka ones weren’t too bad. The episodes she’s written from Deka are Running Hero, Cool Passion, Discipline March, Swat Mode On, Mother Universe, Goldbadge Education, Accidental Present, Fireball Succession; For Magiranger, she wrote stages 8, 11, 12, 15, 19, 21, 25, 26, 29, 30, 33, 34, 39, 40, 47, 48). Judge for yourself how you think Gekiranger might shape up.

Chief director: Shoujirou Nakazawa (has directed random episodes of all of the 2000+ sentai series, but has never been a chief director)

Music: Kazunori Miyake (composer of Hurricanger and Kamen Rider Blade)

Photographer: Fumio Matsumoto, Shingo Oozawa

Character designs: Tamotsu Shinohara (villain designer of Turboranger, Fiveman, Zyuranger, Dairanger, Kakuranger, Ryuki, Faiz, Magiranger, and Boukenger) & Masaru Matsui

Action director: Hirofumi Ishigaki (chief action director of Dekaranger, Magiranger, and Boukenger)

OP theme “Juuken Sentai Gekiranger” performed by Takayoshi Tanimoto (singer of Zatch Bell themes)

ED theme “Tao” by Ichirou Mizuki, the Anisong King!