According to USA Today on Sept. 6, a clip from the "Star Trek Into Darkness" Blu-ray release coming out next Tuesday revealed a portion of what goes on behind-the-scenes with Zoe Saldana and other cast members learning the Klingon language. Saldana found it exciting as far as the usage of "intonation" when learning the the words. She had easily caught on to the script as she read through it and rehearsing it with the experts in the Klingon language.
"She's learning lines incredibly well. She's a very quick learner".
Fans do tend to argue what is intended to be the true Klingon language, but as far as J.J. Abrams is concerned that's debate that he'd rather not get involved in.
Other aspects of the Blu-ray release is behind-the-scenes footage that went into the attack on the Starfleet headquarters, the reinvention of the Klingons, and then the ability to how Abrams went about keeping John Harrison's identity a secret until the film's release.