On 1st note, the OP single is out.
On a second, has there actually been any OFFICIAL game related materials referring to WRS as "White Rock Shooter"?
While going through most of all the scans not one actually says the name, and even in IE's nico vids relating to the game, and even the figma vids directly , they go out of their way to never refer to her as White Rock Shooter, just W.R.S. On scan had a comment from the writer saying the white rock shooter name, but that was just a personal comment bubble from the writer, not directly the article.
Official site update for this week is they unlocked the Battle section. 1st video up is the attack and Evasion.
http://brs.jrpg.jp/battle.html
http://www.youtube.com/watch?v=m54FK8HYU9k