Source: http://thesilentchief.com/2010/12/21/ffxs-yuna-to-appear-in-dissidia-duodecim-012/
FFX’s Yuna To Appear In Dissidia Duodecim 012

New details from this week’s Famitsu reveals that Final Fantasy X summoner,Yuna, will be joining the cast of Dissidia Duodecim 012. No word on if the Yuna to appear in the game will be summoner Yuna from FFX or Yuna from FFX-2.
Final Fantasy’s producer Tetsuya Nomura and director Mitsunori Takehashi also confirmed the following:
There will be more characters from post-SNES Final Fantasy series Yuna was shown as a new character at Jump Festa Returning characters will have a lot of changes, such as Kefka (FF6) and Shantotto (FFXI) The Duodecim Story Mode will have 15+ hours game play The original Dissidia story will be included and enhanced, making total play time over 60 hours Besides the new 3D World Map System, the Board based System from the first game will remain be in the game More summons will be available in the battles Laguna from FFVIII was left out in Kingdom Hearts BBS so he can debut in this game A surprise will be revealed at the upcoming 1st Production Department Premier show -TheMagic Box
Dissidia Duodecim 012: Final Fantasy is set for a March 3, 2011 in Japan.
Wow!!! I am really, really hyped now!!