At today's E3 livestream, producer Yoshi-P noted that Ramuh, Ifrit and Shiva are the most popular Final Fantasy summons, and they needed to get the latter into the game eventually -- leading to the decision to include her. Shiva has a "very long and complicated story" that will tie into the core game, but she won't be making an appearance in patch 2.3.
Photo Gallery: (2 images)
Click to zoom - browse by swipe, or use arrow keys
can cause it. You can fix it by adding *.disqus.com to your whitelists.