When does the new mlb game come out?
No context provided
When does the new mlb game come out in 2017?
March 28, 2017
No context provided
When does the new mlb game come out in 2016?
March 29, 2016
No context provided
When does the new mlb game come out in 2015?
March 31, 2015
MLB: The Show
https://en.wikipedia.org/wiki/MLB%3A%20The%20Show
MLB: The Show is a Major League Baseball video game series produced by San Diego Studio, a development team that is part of SIE Worldwide Studios. 
MLB: The Show Games
The series debuted in 2006 with MLB 06: The Show for the PlayStation 2 and PlayStation Portable, following the MLB series from 989 Sports. There has been a new release in the series every year since 2006.
MLB: The Show Games
MLB: The Show is a Major League Baseball video game series with a new release every year since it debuted in 2006. The 2015 mlb game came out on March 31; the 2016 one came out on March 29, and the one in 2017, on March 28.