The new date falls on a Tuesday, the day of the week in which a majority of new videogame products are released in the North American region.
For the uninformed, Steins;Gate 0 takes place after the bad ending of the original Steins;Gate. A group of students has to time travel in order to prevent the third World War. Like the first game, players can determine the outcome of the story via the in-game smart phone.
The first Steins;Gate came out for the PC in North America on March 31, 2014. It was then ported to the PlayStation 3 and PlayStation Vita on August 25, 2015.
Steins;Gate 0 came out in Japan on December 10, 2015. So it looks like the localized version will be coming out around 11 months later in the North American region.