Apparently, after the anime began broadcast in July of this year, the internet was abuzz with comments about how much people liked this song. For example, netizens were saying things like "Aldnoah.Zero's opening theme is the best!", "Alnoah.Zero's opening theme is looping in my head", "It's really cool" etc.
Aldnoah,Zero, the anime, is directed by Aoki Ei and written by Urobuchi Gen who were also involved in the internationally popular anime Fate/Zero. (I think what the writer for Animate.tv is implying is that because the anime has such big names attached to it, the anime and the OP received a great deal of attention internationally.)
I'll provide the original Japanese text here because I'm not entirely sure how accurate my translation is. If I have time and remember to do it, I may ask my Japanese friend later today. But for now... here goes...
このような世間の盛り上がりを受け、『heavenly bule』が世に出て既に3ヵ月が経とうとしているが、この度急遽、ミュージックビデオを制作することになったとのこと。
このミュージックビデオの為に新たに衣装を制作するなど、かなり力の入った作品になっているとのことなので見逃せない!
I think here, it's saying that they decided to make this PV because of the good response to the song. And because "heavenly blue" has already been released three months ago, they had to hurry to make the PV.
They also had to make new clothes for the PV. I think they put in a lot of effort into the new dresses for the PV so the writer is saying, don't overlook that.