Turtle Tale has been approved by Nintendo of America for release on the 3DS eShop. There's still a little bit of work to be done before the game is ready for release. It shouldn't be too much longer before the game is available in America.
The European release will probably be out a little later than the American release. Nintendo of Europe found a small issue with the European verison. We'll be submitting an updated version shortly.
While Nintendo has been testing the 3DS version of the game, we've been busy creating a Wii U version. We've been making fast progress and hope to be able to submit it to Nintendo around the end of April.