New Mutants star Charlie Heaton recently attended the For Love of Sci-fi convention in Manchester, England, and was asked about whether the movie is ever coming out. Charlie assured fans that yes, the movie is coming out in 2020. The film is stated for an April 3 release, but Charlie never mentioned that date, so for all we know it still might get delayed.
Filming for New Mutants wrapped in 2017 and was originally scheduled to be released April 13, 2018 before that date changed three times. Reshoots were supposed to happen this year, but never did, and its unknown if they'll actually even happen at this point.
Outside of its trailer and poster released two years ago, the film has gone untouched marketing-wise and is the only Disney/Fox property being released in the first half of 2020 that doesn't have a current marketing campaign.