Aside from the debut of a new Ranger team, a new Ranger will also debut in that issue. Making her debut is the Solar Ranger, a mysterious female Ranger who sports purple and black colors. Similar to Lord Drakkon and the Ranger Slayer, she's a character that was made exclusively for the comic and has never appeared in any Power Rangers or Super Sentai Series. Details such as her secret identity and what will be her role in the upcoming story arc are yet to be revealed. The issue is set for a September release.
Heckyl never appeared in Power Rangers Dino Charge or in Power Rangers Dino Super Charge as the Dark Ranger. That being said, issue 35 of the comic book series will reveal how Heckyl became the Dark Ranger. That issue is set for a Janaury 2019 release.
[Source: Power Rangers NOW (link 2), BOOM! Studios Twitter]