Is everyone familiar with how Power Rangers worked? They bought action footage from Japan's long-running Super Sentai franchise, overdubbed American voices, then just shot the unmasked highschool kids locally for additional footage. Basically the show was 100% dependent on whatever the related studio in Japan happened to be doing that year. The show is aimed at about 8-12 year olds in Japan btw.
So, when you say "WTF there's even more?" well, they're 3 years behind the Japanese version. It's so cheap to adapt, so they'll keep churning out Power Rangers as long as it gets aired.
This movie reboot is an "All American" version of the concept. They need to change things around because the Japanese still have the copyright on all the designs: adaptation rights don't give you the right to make unlicensed sequels. So they can't use anything that actually appear in Super Sentai, however they can use any names (e.g. "Power Rangers") that they themselves tacked on the adaptation. So get ready for everything in the movie looking different to the show, for legal reasons. The producers talk about making it a more "mature" series in the article. My guess is that they're going to reboot it in the vein of a hollywood Marvel movie, ditch all the cheesiness and make an "adult" story out of it. But seriously, a gritty reboot of a show where the target demographic was basically 10 years old sound like a potentially terrible plan. Lots of people who might like it would be put off by its heritage as Power Rangers, while Power Rangers fans might be put off by how different it is. And I don't see it as having enough lasting value to rise above those issues. It's a fucking Power Rangers movie after all.