As Kyono reported (see below), Shonen Jump has revealed that a port of Final Fantasy Tactics (with added features, much like the GBA versions of classic Final Fantasy titles) will be hitting the PSP as a part of Square Enix's new "Ivalice Alliance." A few magazine pages have been scanned and are now available on the web--check them out here and here.
The second game Square Enix unveiled, which is currently believed to be titled "Final Fantasy Tactics A2: The Sealed Black Book," is being released for an as-yet unspecified platform--however, it is suspected that the game is being developed for either the Gameboy Advance or the Nintendo DS. Both platforms make sense, given the huge userbase of the GBA and the amazing success of Nintendo's DS, which can also play GBA games itself.
According to Joystiq, another magazine by the name of "Gamelabo" mentions that Square Enix is working on two more games for the Xbox 360, aside from the already-announced Project Sylpheed, which is being developed by Game Arts. However, at this time there is nothing to corroborate this statement.
[Source: Joystiq]