Not only is the game being built for the PS3 hardware, but it's being built to utilise the Blu-ray format as well.
I'm not saying that the game won't appear on the 360...but it won't appear as the same game IMHO.
Also, it's unlikely to appear until a fair bit after the PS3 version has been released. I reckon as much a 1 year after launch.
Prediction (June 12th 2017)
Permanent pricedrop for both PS4 Slim and PS4 Pro in October.
PS4 Slim $249 (October 2017)
PS4 Pro $349 (October 2017)