April has not yet arrived, nor the Google has released any details related to April Security patch. But all this hasn’t stopped Samsung from releasing the Security Patch, as Samsung has released the April security patch for Galaxy J3 (2017), in some countries.
Netherlands and Luxembourg are the regions where the update has been seen live. Currently, there is no information on what all issues are fixed and what is added new. The rollout has just begun, so it will take time to reach everyone.