Apparently a new FF games called Final Fantasy Dissidia will be released on the PSP. Although there is no backup news for this apart from info on the IGN website.

http://uk.psp.ign.com/articles/786/786293p1.html

There is more info in Japanese on the Square Enix site

http://www.square-enix.com/jp/game/psp/

(HELP, can a mod please change the post title, to remove the supposedly, even though I spelt it wrong, cheers) 

But if a mod changes it how will I laugh at your poor attempt at spelling?  I'm just kidding, I spell like a 6th grader at best so I can't throw stones.  Anyways, all I have to say about this is I'm done going off of rumors about Square games.  It's causing too much flame warring for my liking on various web sites, forums, message boards and so forth.  I'm waiting for the official announcements, but it wouldn't surprise me.  Square seems to be tossing good games to every system at the moment.

I thought it was just a rumour, but it's now on their official site under the PSP section, check my first post, the 2nd link.

So this makes it 5 Final Fantasy titles for the PSP.

Final Fantasy I (20th Anniversary)

Final Fantasy II (20th Anniversary)

Final Fantasy Tactics: The Lion War

Final Fantasy VII: Crisis Core

Final Fantasy Dissidia

4 of which are due out this year.  Some amount of FF games on the PSP eh!!? 

Hell yeah, two square games announced in two days and I'll probably end up getting both in the end unless they really disappoint. Good to see the PSP getting more SE love....