Normally, the costume change is indicative of some personality change or being on some off world or in some cases, an imposter or just someone holding it down until the real guy comes back. Changing race doesn't mean the character will be different. It just means their race is different but the character can be the same. If I described Peter Parker's character, none of it is dependent upon him being white.
Breh, as much as people want to crap on Fox lets look at the track record of good to bad: X men, X2, First Class, Days of Future Past, The Wolverine. All made my people who care about the franchise, the characters, and people who want to get it right. Their blunders are the x3, the first wolverine movie, and the two FF movies..all rushed together and in some cases done by people who no longer work with the studio anymore. Simon Kinberg has been steering this ship since First Class and in my eyes, he's three for three and since he's producing this movie as well, along with Matthew Vaughn, another director and producer I love and director of First Class, I feel like they know what they're doing