At this time, we don't know what changes are being made for the DS sequel. However, the game is looking great, with sharp 2D graphics and sprites and some pretty visual effects. Apparently, the only surprising aspect of the game thus far is a lack of stylus control on the DS, which is surprising given the nature of a turn-based strategy title. But with no release date for the game yet given, it's entirely possible Square Enix could add such a feature before the game's release.
Check out A2's logo and a couple images (courtesy of GamesAreFun) below:



[Source: IGN, GAF]