So having tried the demo for ~15min last night, my first impressions are highly mixed, mostly due to 'comforts'.
Graphics are pretty enough, though looking at what other people've said, it's hit or miss as to whether or not the chibi-style characters work out for you. I have no objection, and considering the sheer amount of jobs, each of which have their own appearance, for each of four characters, trying to slim down as much as possible is kind of expected. Backgrounds are relatively glorious.
Audio was off; people were sleeping.
...On second though, I'm going to skip the pretty standard-fare review stuff.
Utilizes the classic FF job system; looks like there's room for ~50 jobs on the wheel. I believe how it works is that you pick a primary job, which influences your current stats and stat growth, and you can take the command skills of another class. You can also equip passives from other classes, though I'm not sure if they have to be out of the primary/secondary you've picked or not.
Pluses:
It's got a pretty generous auto-save option-- appears to kick in every time you transition zones.
Flexible difficulty options: For people doing challenge games (or for who knows what other reasons), you can actually disable character growth entirely. Slider for combat frequency. (Yep, stuff pops out of nowhere in classic JRPG fashion). Combat difficulty.
Language options. (I believe five languages were mentioned, though I only recall English, Spanish and Japanese. Uncertain if this includes voice. Not featured in demo.)
Auto-combat. No idea how intelligent it is; found it on my last battle before sleeping.
Minuses:
For the love of god, if your control interface is on the touchscreen, use the touchscreen! And, if your analog/D-pad isn't being used, give them the same functionality!
No ability to speed up combat. Sorry, I only need to see the basic attack animation a few dozen times. (I admit, I'm probably pretty alone in this-- I spent most of Disgaea DS staring at the tactical map, with all AV options disabled, to the point I pretty much forgot there were graphics...)
Interface feels kind of clunky. I was trying to figure out what my characters' base stats were, to decide what to job them as when I couldn't find their stats from the job selection page. Had to check via the skills page. Seems such a glaring oversight I'll have to revisit this one...
To Taste/Other:
Weird as hell pseudo-sidescrolling map in town.
Mandatory confirmation in combat. Not being accustomed to that, I sat there a few times wondering why nothing was happening after inputting commands.
Has a Streetpass "minigame" where people you meet can be drafted to reconstruct a town. 1 person building the road takes 10 (real-time) hours. 2 people = 5 hours, etc. Supposedly, some rare items can only be obtained here.
Censorship has crept in again. For one, the protagonists have all had their ages bumped up by 3 years, so they now range from 18-20. A bit of change in costumes too. Which is particularly odd, since evidently, they make comments about how skimpy one of them is in-game.
Thinking about it, I might be spoiled by having my last game be Fire Emblem: Awakening, which I find to be pretty amazingly polished...