All 6 Inazuma Eleven DS titles will be released as a single 3DS title, “Inazuma Eleven 1・2・3!! Endou Mamoru Densetsu” for the Inazuma Eleven 5th year anniversary piece.
The 6 DS Games:
-Inazuma Eleven
-Inazuma Eleven 2: Kyoui no Shinryokusha – Fire
-Inazuma Eleven 2: Kyoui no Shinryokusha – Blizzard
-Inazuma Eleven 3: Sekai e no Chousen! – Spark
-Inazuma Eleven 3: Sekai e no Chousen! – Bomber
-Inazuma Eleven 3: Sekai e no Chousen! – The Ogre
Title: イナズマイレブン1・2・3!! 円堂守伝説 (Inazuma Eleven 1・2・3!! Endou Mamoru Densetsu)
Release date: November 29, 2012
Price: 5800 yen
Limited Pressing (Preorder) Bonus: Pair Character Strap
The 3DS release is planned to unlock certain game content in Chrono Stone Neppuu/Raimei games
Buy Inazuma Eleven 1, 2, 3!! Endou Mamoru Densetsu at Play-Asia.com
Also available at CDJapan and YesAsia
More details to come~ So far it seems to be a straight-out port with graphics enhanced for the 3DS (examples here and here), with ways to “enhance” the Chrono Stone games (likely by unlocking certain features).
President Hino has reassured fans on his Twitter that all opening/ending video content from the all the DS games will be available in higher quality in the game, as well as additional content.
T-Pistonz+KMC will be doing an original opening theme for the game, titled, “Yokatta NA” (Thank Goodness). Also of course, the 3-D function will be usable.
The composer for the games, Mitsuda Yasunori, has also mentioned on his Twitter that he is currently working on something related with the game. (I smell full orchestra versions of the background music 
But I hope they keep the original game mixes in there too. We’ll see~)
Update #4: The release date has been pushed back 2 weeks, from November 15 to November 29.
Update #5: Date changed from Nov 29 to “this winter”
Reason they gave out officially is that they need more time for quality checking…
Wonder if it’ll end up coming out after chrono stone raimei/neppuu at this rate o.O;
Update #6: Official Site
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:O that’s so cool! where do we order? CD Japan? >w<
It came in pretty suddenly so it’ll probably be a while before CDJapan or Play-Asia lists them, but I’ll add the links as soon as they do. xD
Play-Asia has a free international shipping sale going on right now, but CDJapan is much more likely to have the preorder bonuses while Play-Asia oftentimes doesn’t. Still waiting on some info so we’ll see. xD
Here are some scans:
http://www.gonintendo.com/content/uploads/images/2012_8/2.jpg
http://www.gonintendo.com/content/uploads/images/2012_8/3.jpg
I am excited for this news as I just recently got a 3DS but I wish at least the US release this in English… D: For sure EUR will get this but the US… even just this game… release it to the 3DS… OTL
I definitely need to buy a Japanese Nintendo 3DS… I would love to replay this masterpieces with enhanced graphics *-* and I REALLY WANT to enjoy the Openings, endings and videos in better quality ! My gosh xD there are so many reasons to buy a Japanese 3DS now !
An interesting request that we should support =D :
http://www.change.org/es/peticiones/level-5-inc-inazuma-eleven-1-2-3-endou-mamoru-densetsu-in-america