After the recent leak of 2 of the PS+ games for December were revealed, Sony have officially announced those two titles will be coming to PS+. Those 2 PS4 titles are Invisible Inc. Console Edition on PS4, and the ever-changing narrative of Stories: The Path of Destinies.
There are also 2 PS3 titles and 2 PS Vita titles as always. Here they are:

Full Lineup

• Invisible, Inc., PS4
• Stories: Path of Destinies, PS4
• Hyper Void, PS3
• Tiny Troopers Joint Ops, PS3 (Cross buy on PS4 and Vita)
• Color Guardians, PS Vita (Cross buy on PS4)
• VVVVVV, PS Vita