SQUARE ENIX and Platinum Games Inc. has announced that the upcoming NieR: Automata, will have a collaboration with FINAL FANTASY XV in early 2017. The Engine Blade, as used by Noctis in the game, will also feature as a weapon in NieR: Automata for protagonist 2B. Equipping the Engine Blade will also alter the evasion effects and damage display to match the style of FINAL FANTASY XV.
You can catch some screenshots below.
The companies haa also announced plans to feature content from the NIER series in FINAL FANTASY XV.
Further updates will follow at a later date.