Will Assassin's Creed III: Liberation Come to PS3/Xbox 360? Extremely Unlikely

Extremely unlikely.

Why a Last-Gen Port Won't Happen

• Hardware gap: Liberation (Vita/PS3/PC/PS4/Switch) was built for newer architectures. Porting to 2005/2006 CPUs/GPUs would require massive downgrades.
• No financial incentive: PS3/360 user bases have migrated; development cost far exceeds projected sales.
• No announcement: Ubisoft has never hinted at a last-gen port post-2014.

Play on PS4, Switch, PC, or Vita. The PS3/360 era for new AC titles ended with Assassin's Creed Rogue (2014).