The movie is on indefinite stoppage
The issue is said to be the script. Paramount has delayed several big movies from this year to 2013, including G.I. Joe: Retaliation and Brad Pitt’s World War Z, leaving it with a spotty pipeline for the current year. Now it has halted work on its planned holiday movie for 2013, temporarily laying off preproduction staff and informing those prepping the film that the work stoppage is "indefinite," according to sources. Another source close to the production says the movie has been pushed by ten weeks.
http://www.hollywoodreporter.com/news/paramount-shuts-down-ninja-turtles-338301