The January 30, 2017 released PlayStation 4 version Double Dragon IV postponed and it will be available again from February 8, 2017 from the PSN. It should be noted that the PC edition still available from the Steam for the same price.
The PS4 edition Double Dragon IV still will be available for 800 Yen (with tax).
URL: http://www.arcsystemworks.jp/dd4/news/