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It is officially scheduled for this summer! Yay! heart

http://tinycartridge.com/post/19730788038/theatrhythm-hitting-the-u-s-this-summer

It got a good review on IGN!
http://www.ign.com/articles/2012/06/28/theatrhythm-final-fantasy-review

It'll also be out very soon! Europe got an eShop demo, but I guess NA won't until its already out if we do at all.

So, there were already songs to download from the shop on day 1. Here's the list so far. (They're .99 each.) There are Battle songs and Field (travel) songs.
The thing that kinda sucks is there's no preview, so I've had to look them up on youtube to hear them first. I made a list to save other folks the time.
But don't hate on the game too much for having dlc, there are a lot of songs that are included. I think these are actual download (as opposed to just unlocking something on the cart) so that likely means they could keep expanding it later on. These save to SD card and take about 40 blocks each.
There is 2 save profiles for the game, and any bought songs are valid for both.

BMS Songs
Battle Theme 1- FFII http://www.youtube.com/watch?v=0UXx6bGSpMo (second song)
The Final Battle- FFIV http://www.youtube.com/watch?v=lJ-7Wk42aM0
Fighters of the Crystal- FFXI http://www.youtube.com/watch?v=TsLkGEDwLLc
Fighting Fate- FFXIII http://www.youtube.com/watch?v=vbMbQLUr9cA

FMS Songs
In Search of Light- FFV http://www.youtube.com/watch?v=bn3BrNZPLyA
Cosmo Canyon- FFVII http://www.youtube.com/watch?v=w5QVFUL-_Wg
Ride On- FFVIII http://www.youtube.com/watch?v=Ph1dTOivMfE
A Fleeting Dream- FFX http://www.youtube.com/watch?v=zkAFi88J5Aw

So far I just bought the first and last BMS song. Battle songs are usually good. I'm considering some of the other ones, there really aren't many songs that aren't good in FF.

There's no walkthrough FAQ up yet, honestly the game is mostly just playing with skill, but there is a list of stuff you can unlock simply through playing enough- http://www.gamefaqs.com/3ds/635802-theatrhythm-final-fantasy/cheats

I just bought it and, so far, I'm having a blast! But, I do love rhythm games, so...yeah. It was expected that I would like it.

Heh! I got lulled into a false sense of security by the series songs. Those are fairly easy. So, I'm bopping along, breezing through and coming out with high ratings. Then, I unlock a dark note. I think to myself, "Self, let's try this!"

I then proceed to get my butt handed to me. The chaos shrine is a heck of a lot harder than the series! But, now I know. I'm probably going to have to do those several times before I get the hang of them. XD

I've unlocked a couple characters and am really close to unlocking some others. I got my first rainbow shard last night biggrin Looks like I'm getting into finding some of the harder ones now. Also got my first characters to lvl 99!

Wow you're far better than I. I generally mess up at least once even on songs I know well. And the event ones seem really picky, sometimes I miss when I swear I nailed it.

Holy crow, I didn't realize, but there were 2 more months of DLC songs added! They're up to 52 additional songs! I'm going to have to see if there are more I want...

The whole song list is-

July 12:
"Somnus" (Final Fantasy Versus 13)
"Desperate Struggle" (Final Fantasy 13)
"Sarutabaruta" (Final Fantasy 11)
"Battle" (Final Fantasy 6)

July 19
"Fight On!" (Final Fantasy 7)
"Etro's Champion" (Final Fantasy 13-2)
"Battle Theme" (Final Fantasy 11)
"Battle 1" (Final Fantasy 3)

July 26, 2012
"A contest of Aeons" (Final Fantasy 10)
"The Archylte Steppe" (Final Fantasy 13)
"The Sanctuary of Zi'Tah" (Final Fantasy 11)
"Crystal Cave" (Final Fantasy 3)

August 2, 2012
“Movement in Green” (FINAL FANTASY X)
“March of the Dreadnoughts” (FINAL FANTASY XIII)
“Gustaberg” (FINAL FANTASY XI)
“The Crystal Tower” (FINAL FANTASY III)

August 9, 2012
“Battle Theme” (FINAL FANTASY X)
“The Dalmasca Estersand” (FINAL FANTASY XII)
“The Darkness of Eternity” (FINAL FANTASY IX)
“This is the Last Battle” (FINAL FANTASY III)

August 16, 2012
“Challenge” (FINAL FANTASY X)
“Desperate Fight” (FINAL FANTASY XII)
“Battle 2” (FINAL FANTASY IX)
“The Final Battle” (FINAL FANTASY V)

August 23, 2012
“Otherworld” (FINAL FANTASY X)
“The Royal City of Rabanastre / Town Ward Upper Stratum” (FINAL FANTASY XII)
“The Final Battle” (FINAL FANTASY IX)
“Battle 1” (FINAL FANTASY V)

August 30, 2012
“Final Battle” (FINAL FANTASY X)
“Boss Battle” (FINAL FANTASY XII)
“Dark City Treno” (FINAL FANTASY IX)
“The Decisive Battle” (FINAL FANTASY V)

September 6, 2012
1. “The Extreme” (Final Fantasy VIII)
2. “Esper Battle” (Final Fantasy XII)
3. “Fight 2” (Final Fantasy IV)
4. “Dungeon” (Final Fantasy II)

September 13, 2012
1. “The Castle” (Final Fantasy VIII)
2. “The Battle for Freedom” (Final Fantasy XII)
3. “Undersea Shrine” (Final Fantasy)
4. “What Becomes of Us” (Final Fantasy: Type-0)

September 20, 2012
1. “Force Your Way” (Final Fantasy)
2. “Ragnarok” (Final Fantasy)
3. “Matoya’s Cave” (Final Fantasy)
4. “Tower of Mages” (Final Fantasy)

Or you can see them on the wiki arranged by game- http://finalfantasy.wikia.com/wiki/Theatrhythm_Final_Fantasy