Updated - Square Enix has confirmed this is indeed for the Nintendo DS.
Quick News - A new set of games under the heading of the 'Ivalice Alliance' (which includes FFXII Revenant Wings on DS) has been revealed by Square Enix. One such title is 'Final Fantasy Tactics A2 - The Sealed Grimoire', which is thought to be a DS sequel to the GBA version.
Stick around for when more details leak out...