Are we all forgetting that when Saban was in the production phase of the Mighty Morphin TV show, Toei offered to help them make something unique and even drew up original designs for the Zords and everything (they were similar to the ZyuRanger designs, but still distinctly different), but Saban turned it down because using Super Sentai footage was cheaper and easier? This could all be a second chance at that. This could be their attempt to make the Power Rangers movie something very unique without borrowing as many elements from Super Sentai, possibly with design help from Toei (though, I kind of doubt that since Rita's costume doesn't really feel like the kind of thing I usually expect from Japan...).
Though, if there is ANY truth to what I am saying, it makes me extra curious what the Ranger suits will look like. It'd be in their best interest to make this movie somewhat visually similar to the Mighty Morphin look that everyone remembers, so how will they do that while making a new and unique design? They couldn't do that with Rita, apparently, since they went with a purely original design... Things were so different in 1995. When they made the first movie, even if they turned the tights into armor, they did their best to make the costumes look like the ones from the show because the show was airing. They needed to make sure kids could recognize it visually. Now it's 2016. Maybe they truly believe it's safe to experiment with looks and try things they couldn't do before? Just speculating...
Who knows? Maybe this will become a Story VS Looks scenario. You could have a movie where the characters and suits look very similar to what you remember, but the story sucks. On the other hand, you could have a movie where the characters and suits look extremely different, but the story is actually good. Anything could happen once the movie gets going. In this movie's case, maybe Rita's costume starts out green and gold, but gets progressively more witch-like or Bandora-like as the story goes on because reasons. Even the Spidey suit that Andrew Garfield wore looked really dumb, but the story was pretty good, and they made the suit more comic-accurate in the sequel. If this movie ends up being good enough for a sequel, they may do the same thing. But that's just me trying to be positive about all this. It could still end up being completely horrible all around, but we should still wait and see.