Wonder Woman is known in Europe. I don't know where people get the idea that she's not, she's easily the most well known and iconic female superhero around.
No, that would be Mary Magdalena. Origin continent of Roman-Catholicism and all.
As for 'wonder woman', she's pretty much only known as a joke. Sexism is quite well and alive, but over the years I've never encountered anyone taking that character seriously. Margaret Thatcher, sure. Queen Elizabeth? Aw yeah. Wonder woman? Who?
That character is neither a role model nor an interesting character in its own like bats and supes are, so there is basically nobody saying "we need this" here. We have actual queens here, we're good on the possible female role model, even if most of those functions are ceremonial in parliamentary democracies.
The only reason we would see it is because there would be nothing else around, it would marketed, we already saw her in BvS, or it was specifically marketed around 'female lead' but that's kind of silly since those are quite common in euro (indy) productions. Which is not to say it's not a factor (as far as major action movies go), but it won't be significant vector for getting people to see it in cinemas.
It is not going to do anything special outside of the US unless it's balls-to-the-walls crazy or something. But considering BvS, it will probably do similar or slightly better than expected. If it's trash like BvS, the word of mouth is going to kill it dead, and it's going to bomb hard like F4 did, making a sub-400 million result possible (but not likely). If it's decent enough, 500 million ww should be doable.
However, the damage done by BvS is going to be a factor. WoM stopped that movie in its tracks, and a different kind of audience -oddly enough- brought up Suicide Squad as a contender. That latter audience, the hot topic crowd, will probably not show for WW, so if you know the vector that WoM had on BvS, you can take the expected number on WW and apply that vector to it, which should give a reasonable estimate of how it will do if it's similarly received.
