Rise of the Planet of the Apes director Rupert Wyatt was set to return for the sequel, but recently left the project and was replaced by Cloverfield/Let Me In director Matt Reeves. With the director change, a new writer has been brought on board.

Previously Amanda Silver and Rick Jaffa wrote the draft, and Scott Burns was hired to do additional work. Now, it is being reported that Mark Bomback will be making changes for Reeves. According to THR, he did uncredited work on Rise of the Planet of the Apes and has also worked on Live Fre or Die Hard, Total Recall, and The Wolverine.

Dawn of the Planet of the Apes already has a release date set for May 23rd, 2014. While there should be more casting announcements in the near future, Andy Serkis is officially signed on for the sequel.

"The project continues the story set forth in last year’s critical and commercial hit movie featuring simians that are given human intelligence and subsequently break out of their facility. At the same time, a virus breaks out that causes the collapse of human society. The new project is taking the story to the next level, with the apes on the path to emerge as society’s new rulers."

Source: THR