There had been rumors that Dwayne Johnson was going to be joining the cast of Fast Five. Now it appears that those rumors have some validity based on a recent post from Fast Five co-star Tyrese Gibson. At his Twitter account he wrote:

Major shouts to Vin Diesel, Paul Walker, & Dwayne "Rock" Johnson!! "Fast & Furious Five" Let's get em again!!
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Collider is also claiming that that their sources are confirming this and that there should be an official announcement shortly.

Also, Ludacris also sent out a message via Twitter that he too was coming back for Fast Five:

Just landed in Puerto Rico. Shooting for Fast & Furious 5 is about to be underway.....

Tyrese Gibson and Ludacris are no strangers to this franchise having both been in the second film 2 Fast 2 Furious.

We will have more on these casting reports as they arrive.

Evan Jacobs at Movieweb
Evan Jacobs