There isn't a release date for final fantasy versus yet
The release date has not been announced yet.
No, this game has been renamed Final Fantasy XV and there has been no word on release date. My best guess would be that the game will be released in 2016 for Playstation 4 and possibly Xbox One.
September 30th
Versus XIII is a game exclusively for the PS3, for now, so it has a 0% chance of appearing on the PSP. But another game from the same Fabula Nova Crystallis project will be released on the PSP. It is called Final Fantasy Type-0, previously called Final Fantasy Agito XIII. It will be released in Japan this summer (2011) and has yet to have a release date for a Western/EU version.
Although no one knows for sure, Tetsuya Nomura (Creator of previous Kindom Hearts and the Final Fantasy's) Has revealed that in 2009 Final Fantasy XIII and XIII Versus shall come out, not revealing the percific date. He also said he wanted to finish Final Fantasy XIII before attempting to finish Kingdom Hearts 3. So I hoped this helped.
May 14, 2014
Sorry to disappoint you, but Final Fantasy Versus XIII hasn't even been given a release date in Japan, it's still in development. We should give Square Enix as much time as they need or we risk it becoming garbage, and this game looks TOO AWESOME to risk turning into garbage. But don't worry, I would bet that it will be a big deal when a release date is announced and it should be hard to miss. :)
dissidia is already out...2008-2009
There's no release date yet for Kingdom Hearts III. There will be Kingdom Hearts III and that won't be the ending of the series! but Kingdom Hearts III won't come out until Final Fantasy XIII Versus is release.
Has of June 2009 it will be released in April 2010 in the US
There are three games encompassed under the title Final Fantasy XIII.Final Fantasy Agito XIII (PSP) and Final Fantasy Versus XIII (PS3) have yet to get release dates, but the main game Final Fnatasy XIII for PS3 and Xbox360 will be released in Japan on December 17th 2009 and in America and the UK in April 2010. These are the dates released officially by Sony, however, several online shopping websites (Amazon and Play) say that the game is not released till June 2010, so choose which you believe.