As was the case with the first feature release of J.J. Abram's Trek reboot, the official novelization of Star Trek Into Darkness has been penned by Alan Dean Foster. It's scheduled for release on May 21st.
The blurb already provides some bits of information not in the movie AFAIR (dating the story relative to the 2009 movie's, hinting at the backstory of Kronos):
Simon & Schuster seems to no longer provide excerpts since their website redesign went live, but Amazon.com has a "Click to look inside" feature for this one already: http://www.amazon.com/exec/obidos/ASIN/147671648X/Months after the dramatic events seen in the 2009 blockbuster film Star Trek, the crew of the U.S.S. Enterprise—including Captain James T. Kirk, First Officer Spock, Doctor Leonard McCoy, Lieutenant Nyota Uhura, Chief Engineer Montgomery Scott, Lieutenant Hikaru Sulu, and Ensign Pavel Chekov—is called back home. But an unstoppable force of terror from within their own organization has declared all-out war on Starfleet and everything it stands for, leaving Earth in a state of crisis. Now with a personal score to settle as a result, Kirk must lead a covert manhunt to a war-zone world to capture a one-man weapon of mass destruction. As these valiant heroes are propelled into an epic chess game of life and death, love will be challenged, friendships will be torn apart, and sacrifices must be made for the only family Captain Kirk has left: his crew.
Side note: I've chosen to go with "ALT" as the label for alternate reality releases for now.