Actually, almost every site is saying it. Here is one example. http://www.carscoops.com/2016/03/reports-says-mazda-cx-4-will-be-china.html
The statements are similar:
"If this all sound enticing, you’d might be disappointed to find out the CX-4 won’t be available in the U.S. anytime soon, as it will be initially manufactured in China and sold only in that country, as spokeswoman Michiko Terashima told Automotive News. Sure, the company is considering to release the automobile in other markets, but at this point, nothing has been decided, according to Terashima. "
Basically what they said about the diesel Mazda in the USA. The CX-4 will not be coming to the USA any time soon.