A couple of days ago, it was announced on the Dark Souls website that the game was going to be released on March 24, 2016 in Japan with some bonus features like an extra map and a soundtrack. But there was no clue as to when the game would be released in other countries.
Bandai Namco Entertainment America has announced that the game will be released in April 2016 in North and South America on all 3 platforms i.e. PS4, Xbox One and PC. Though the date is a little late than the Japanese version of the game, but it is still better late than never.