According to NeoGAF they have uncovered news about Final Fantasy XII: Revenant Wings starting a story arc called Ivalice Alliance. Which will be releasing a port of Final Fantasy Tactics for the PSP called Final Fantasy Tactics: The Lion War along with a Final Fantasy Advanced sequel. Called Final Fantasy Tactics A2: The Sealed Gilmore which there are no details on at the moment( like whether if it's DS or GBA)
I found this out from GoNintendo.
This was confirmed by Jump. Not too long ago.
And here's the link: http://www.neogaf.com/forum/showthread.php?t=133531