Wonder Woman is distributed by Warner and it is their policy not to region lock their Blu-ray discs. These will all be region free.
It is very common with online retailers to err on the safe side and specify region coding that is the default for their country.
They may (or may not) fix the region information once a title is released, but in general, one shouldn't take region information for Blu-rays in online shops as absolute truth.
But when they explicitly specify "region free" / "all regions", they usually are correct.