Sony are publishing the Vita Minecraft not 4J. No doubt they threw money at development of the Vita version to make it happen.
If Nintendo do the same they might also get it, however I would also question the 3DS' ability to run Minecraft, even with the new model, would it actually have the hardware grunt for it? PS3/360 versions are cut back from the PC version, and the Vita version I understand will be cut back a little more (though better than the Pocket edition).