It’s now confirmed that Mockingjay will be split into two movies. The release dates has been announced!
Here’s a report from Deadline:
Lionsgate will release two films based on Mockingjay, the third book in Suzanne Collins’ Hunger Games trilogy. The Hunger Games: Mockingjay Part 1 will bow worldwide November 21, 2014, followed by The Hunger Games: Mockingjay Part 2 on November 20, 2015.