Taken from another source:

About a month ago it was announced on the trades that Vin Diesel and Paul Walker were in negotiations to reunite for the fourth installment of Universal's "Fast and the Furious" franchise. Justin Lin and Chris Morgan, who were behind "Fast and the Furious: Tokyo Drift," are returning to directing and writing duties, respectively.

The story line is being kept under wraps UNTIL NOW. During the Holiday break I was able to read the script and hand it back to its proper owner SO DON'T BOTHER ME OR EMAIL WHETHER OR NOT I HAVE THE SCRIPT. I DON'T.

What I managed for you fine folks was write up the the setup or first act. This is by far the best of the 4 movies in the Fast and the Furious franchise. Its a really good story.

vinpaulff

FF4 opens with a flashback from the ending of the first film of Paul Walker’s character BRIAN O’CONNOR letting Vin Diesel’s character DOMINIC TORRETO go free.

The story picks up five years later.

FENIX drives a DEVIL RED DAYTONA and leads for other hot rod cars across the Mexican border to San Yisidro. One of the drivers is Michelle Rodriguez’s character LETTY. The five cars pop the trunks. They were transporting large polymer containers that get loaded onto an 18-wheeler.

Fenix pays Letty and she leaves. Letty heads in her Demon to Los Angeles. Fenix follows her.

We then catch up with BRIAN O’CONNOR at MARICOPA COUNTY JAIL in Arizona. He is now bearded, tattooed, darker and grittier since we last seen him. He is working out in the jail when he stops JUVENAL from getting killed by MS13 gang members. A big fight ensues between Brian and three MS13 assassins.

In the segregation ward, Juvenal tells Brian that JAMES PARK sold him out. That is all that Brian needs to hear. Brian is actually undercover in the prison working with the FBI.

Next in SANTO DOMINGO in THE DOMINICAN REPUBLIC we meet TEGO who bops his head to reggaeton in his ’69 EL Camino. Tego rides with HAN from TOKYO DRIFT.

If you recall HAN died in TOKYO DRIFT, so in essence, FF4 is a prequel to TOKYO DRIFT.

Tego and Han catch up with FLORA and MARCO in a tiny run down shack where cars are being worked on. One of the mechanics is DOMINIC TORRETO. Dom is now stronger, harder and more dangerous than before.

Dom and his crew go hijack a tanker on a land train.

Afterwards, at 3am in the industrial part of town, and UNDERGROUND RACE MEET is in full swing. Dom receives a phone call from his sister MIA. Something happened to Letty.

She’s dead!

In Juarez, Mexico, Dom hooks up with CHUCHO at a garage. Dom gets his 7O’s SS Chevele – the same car we seen him with at the end of Fast and Furious. Jason Bourne may have a locker in every country, but Dom has a garage.

Using a fake passport under the surname ALVAREZ, Dom drives in through the border through El Paso, Texas.

At a cemetery in Los Angeles, Dom attends LETTY’s funeral on the dl. A gathering of racers are there including Dom’s sister MIA TORRETO (Jordana Brewster).

Dom watches the funeral from a distance to avoid being made by the cops. A voice tells Dom he shouldn’t be here. It’s Brian O’Connor. When Dom crossed the border he tipped off alarms. Facial recognition software matched him ten minutes after he was through. The cops are after Dom. Brian is not there to arrest Dom but to attend Letty’s funeral since she was Brian’s friend too.

Brian tells Dom that when he bailed to Mexico, Letty tried to hold it down. The garage, the crew. Letty needed money so she started making runs across the border with a team working for ANOTNIO BRAGA.

Braga is a major player down south. Last year, he moved more heroin across the border than Pablo Escoba did in ten years. Braga uses tuner cars for mules. All this and no one has ever laid eyes on Braga.

The Feds have been after Braga for years but can’t touch him south of the border. Brian tells Dom he is going to get the guys who killed Letty.

Dom replies – not if he gets them first.

So there you have it, the setup for FF4 is that Brian and Dom must infiltrate the Braga organization to find out who killed Letty and why.

interesting hopefully it will be the most realistic out of the all the movies

^^ word thats what i hope.

You got that right. I hope it's not a waste.

yeah the last one was not so bad i think so i hope this one is better

i liked the first fast and the furious but i was like 13 when it came out :-p the 2nd one sucked, the third was kinda cool, and hopefully this one will be good

I'm sure I'll be there on opening weekend.

That doesn't sound half bad, I may have to go to that one in the theater.

yeah, i dont think i could watch Han drive a hot rod, too used to sweeing him in that super sweet rx-7.
ill probably see it, the first two sucked imo..

I still haven't seen Tokyo Drift