Have to remember most of the population don't generally care who is playing who, its us "fans" who go into a meltdown over who is playing Batman or heading Han's speach in the trailer... To everyone else its simply "oh a new Batman" and "new Star Was at Christmas, cool I will see that when I can".
I never guessed from just seeing pictures and watching earlier footage that it was a woman, now I know it seems so obvious with certain posturing, movements ect (could just be in my head but others have said the same thing) which is one of the cool things I like already about her, the fact she is a she and not a he doesn't seem to matter and it will hopefully come to pass that the character named "Phasma" is a massive threat who kicks rebel booty when ever and where ever she needs to.