all of those new titles as part of their "DC You" publishing initiative, DC also attempted to make the June issues all of their pre-existing titles good jumping-on points, by starting new story arcs and launching new directions for the titles. In the case of the bigger characters, those new directions were rather radical.
Superman's secret identity was revealed to the world, he was greatly de-powered, he got a haircut and started wearing a more casual costume of jeans and a Superman t-shirt again. Batman is presumed dead, and so former police commissioner James Gordon is taking over the role of Batman, wearing a huge suit of robotic armor. Even Aquaman and Green Lantern Hal Jordan received pretty dramatic new costume changes and shifts to their status quo (with both being labeled fugitives).
And as for Wonder Woman? Well, she basically just changed clothes.
June's issue of Wonder Woman, which is still being written by Meredith Finch and still being penciled by David Finch, includes a scene where Wonder Woman visits her half-brother Smith/Hephaestus to pick up her new outfit. It's mean to be a reflction of everything she is now, she says, "god, queen, warrior for justice."
In the back of the $3.99, 20-page Wonder Woman #41, there's a two-page feature labeled "Warrior Wear" which features a half-dozen preliminary sketches–including one which looks an awful lot like a Donna Troy/Wonder Girl costume, and another that looks like the final version with a cape attached–and a sheet of the final costume from three different views.
There's a block quote from Finch, and six short paragraphs about the design process.
Meredith Finch is quoted saying basically what Wonder Woman does in the script: I really wanted her new costume to reflect all of her roles: old–as in, member of the Justice League; and new–as in, God of War and Queen of Themyscira."
By "what any of the men wear," I assume Finch was referring to what the other Justice Leaguers wear, and that, of course, means showing less skin. In that regard, pants are usually what gets added whenever someone tries to improve upon Wonder Woman's costume (in fact, New 52 Wonder Woman was going to wear pants instead of shorts, until fandom collectively freaked out). Covering her bare arms as well is a more unusual move (Jim Lee's infamous pre-Flashpoint redesign included a jacket though). Interestingly, "the men" are showing a bit more skin now than they did when they last had makeovers: Superman's wearing short-sleeves, and Aquaman's wearing no sleeves.
I always find it a little silly when someone tries to articulate practicality and what a superhero costume should look like in "the real world," especially for a fantastic character like Wonder Woman. Like, what would "a woman in the real world" wear to fight crime? A police uniform. And...that's about the only option, really.
What would a super-powered demi-goddess from an ancient, immortal race of warrior women wear to fight crime in the real world...? Who cares? The real world is not one in which a super-powered demi-goddes from an ancient, immortal race of warrior women exist at all, full-stop.
I don't care for the costume at all. It's a worse one than the original New 52 redesign (which was just her New 52 costume, but with black pants instead of shorts) and Jim Lee's redesign from J. Michael Stracynski's ill-fated run on Wonder Woman. It's basically just her current costume worn over a black unitard, with a pointy loincloth and shoulder-pads and thigh-high boots. As for how her knife-bracelets work, she doesn't use them at all in this issue, but I've never really understood outfitting Wonder Woman with edged weapons. A "warrior for peace" doesn't really need anything to stab with, you know?
Ideally, Wonder Woman would just change clothes when she was fulfilling the different roles in her life: Wearing her superhero costume when being a superhero, adding Bronze Age accessories like bits of armor and a battle-skirt when being an Amazonian warrior, putting on a nice clean toga when being a queen, and putting on War/Ares' helm and cape when god of warring. It's not like anyone has one outfit they wear in all occasions, designed to reflect every aspect of themselves, you know?
But then, this costume change is really just a change for change's sake, something to give Wonder Woman a hook to potentially draw in new readers, and it shouldn't last all that long.