Details of the plot have been released.
It's been 10 years since the events of the Go-Onger TV series. A man called Noizumi is the Minister of Defense and has somehow created an 'Isolation Barrier' separating Human World from all others. This prevents any more attacks from the other worlds but also cuts the Go-Ongers off from their Engine partners and prevents them from assisting any other worlds. The Sentai Activity Ban has been passed into law and enforced by special police, forcing the Go-Ongers into hiding, with the exception of Saki (Go-On Yellow) who joins the government as a public relations officer.
Suddenly new events force the former heroes back into action. A young boy called Souji is being chased by the special police as he appears to have the Engine Cast of Bear-RV. Three villains called the Eleki Clan appear. It's up to the Go-Ongers to try and help Souji and save the world once again! But with a member missing they are forced to bring in a substitute to act as yellow ranger - former Water Pollution Minister Kegalesia?!
Back from the dead
Still got a valve on her head
The Eleki Clan:
Gireizky, Noizoon, and Zontark
In addition to the cast of Go-Onger, 10 Years Grand Prix will feature Satoshi Jinbo (who formerly played Alternative Zero in Ryuki and a teacher in Fourze) as Minister of Defense Noizumi, and Yu Kamio (Dr Maki from OOO, Captain Kamiki from Ultraman X, Tachibana from Amazons) as Torao Kurei, the leader of the special police.
Rai Takahashi, who played Emu in flashbacks to his childhood during Ex-Aid, will have a "key role" (I'm guessing as Souji?).