As many saw in the TGS 09 trailer for Final Fantasy XIII, there was a female I'Cie working for Cocoon; that woman and her summoned have been identified. The woman is called Oerba Yun Fang and her summon will be Bahamut. If any have caught on already, there is another character that has "Oerba" in her name - Oerba Dia Vanille. This could either be that they are related in some way or that "Oerba" is a common name. When has there been a common name in a Final Fantasy? I can't recall any which leads me to believe that they are likely related.

Here is the link that shows a the new scans on this subject: Final Fantasy XIII Scans Reveal New Character and New Summon on VGChartz.com