Since the new Hitman game is a part of AMD's Gaming Evolved program and will use certain DirectX 12 features, including Asynchronous Compute Engines (ACEs), it really does not come as a big surprise that it is part of AMD's new promotion.
Since the game is not yet out and Square Enix scheduled it to launch on 11th of March, buyers of eligible graphics cards and CPUs will be getting the Hitman game code to download the game when it becomes available.
According to the promotion page, the game will be bundled with AMD's Radeon R9 390 and R9 390X graphics cards and AMD FX-series 6-core and 8-core CPUs.
The promotions started on February 16th and will last until April 30th or while supply last. As it was the case with earlier AMD promotions this one is also limited to certain retailers and regions so you should check out the list before going shopping some of those eligible products.