The Mark 45 is the first armor to feature the new female Artificial Intelligence / A.I. Friday, who was integrated into the armor before the Battle of Sokovia.
It is featured in Avengers: Age of Ultron, along with the Iron Legion Armor Drones, the Mark 43, and the Mark 44. The Mark 45 is also the first armor to feature a hexagonal outline design for it's Chest Repulsor Transmitter (RT).
You can download this papercraft toy here: Iron Man Mark XLV (Mark 45) Mini Papercraft Download