Plot reveals about Transformers 4 hint that Optimus will die in Age of Extinction and one group of the Transformers will battle the Dinobots.

A video from the film set in Hong Kong, leaked online, alluded to the death of Optimus Prime.

Transformers 4 Movie Spoilers: New Photos & Video Featuring Mark Wahlberg and Optimus Prime Voice Action.

Judging by the translation of the voice-over in the clip it seems like Optimus Prime is saying his farewells to Mark Wahlberg (Cade) and the Autobots, asking them to take the mission forward without him:

"There remains a price on my head, and I risk endangering you if I stay. Cade when you find the remaining stones, mark one as my soul. Defend this family Autobots, as they have you, goodbye, don't forget me."

Transformers 4 Spoilers: Optimus Prime Robot Design Revealed, New PHOTOS.

Director Michael Bay recently wrapped shooting the film in Hong Kong, which will comprise of about 30 minutes of the entire duration of the film. He  said he shot a crucial turning point of the movie at the Wulong Karst National Geology Park. Bay released photos from the filming in Wulong Karst and in the respective scene a group of Transformers will reportedly meet another group of transformers to battle their way out of a crater that was created by a crashed starship.

Some publications speculated that the "other group of Transformers" will actually be the Dinobots.

Jack Reynor is the male lead of the film and will be playing a race car driver. Nicola Peltz acts as Reynor's girlfriend in the film and Wahlberg will portray Flynn Vincent, Peltz's dad. Kelsey Grammer will be playing the role of Harold Attinger, a counter-intelligence agent who is the main antagonist in the film.

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Transformers: Age of Extinction comes out Jun. 27, 2014.

Watch a recent interview of Bay with the South China Post: