Their's been some handwringing about his ethnicity because he could possibly be Asian because it hasn't specifically been said he's isnt despite looking white, having a western name and coming from a Anglo-American social background. In addition some character nobody has ever heard of is being played by tilda swinton and she was specifically Asian.
This has been sort of been milling around for a while. The idea that counter-culture needs more minority characters isnt dumb, the problem is it's suggested by people who are retards and they usually suggest stapling on said group onto a established characters. This can work with legacy characters ms marvel whose currently a Muslim nerd but generally is really stupid like the girl Thor cringe fest. It's also totally hypocritical because they lose their shit when it's the other way around.
Generally these things are shit because they're written by the sort of people of people who thinks that gender flipping established guys is the way to create good original character do not steal is to gender flip an established one, you're usually a shitty writer if you're that stupid. Plus you're saying the way to make it as a girl is to be a guy first.
Naturally nerds being no where near as smart as they like to think and often being not the most socially adept people can't really articulate meaningful critiques of why girl thors, black link and gay wolverines are shit and sperg away, this gives the media an opportunity to pretend their's controversy over New Thor because nerds hate women/gays/whatever. It also gives slacktivist liberals in said counter-culture an chance for their half assed musings on society to be sort of relevant for about 10 minutes as they sperg out at their fellow spergs. The companies involved make a few quid and some good pr for pretending to stick up for whoever so they repeat et-nausium.
TLDR-Social justice warriors want to black up or gender bend white male heroes. This is a stupid idea but generates some sales and PR