It is confirmed to be in the works, Iwata mentioned the "DS2" when talking about the new iPad, talking about what features would be enough to win over customers, so it could just be in the ideas process. He also mentioned a Wii HD would need more than just HD to get customers, so that could be in the ideas stage too.
Originally Posted by BCVM22
On a 3rd Gen Game (Temporarily Unavailable for Trade-Missing DS with a GBA Slot): Bonus Disk Jirachi, 10 ANIV Celebi, 10 ANIV Typhlosion, 10 ANIV Suicune, 10 ANIV Espeon, MYSTRY Mew, XD Lugia
On a 4th Gen Game: ALAMOS Darkrai, Japanese Member Card Darkrai, Zoroark Movie Scizor, 11219 Mew, NZ Jirachi, Japanese Regigagas to activate the event
On a 5th Gen Game: GAMESTOP Suicune, May 2012 Darkrai x 3, June 2012 Victini x 2, Spring 2012 Reshiram, Spring 2012 Zekrom, 2012 Arceus, Liberty Island Victini