They don't though, they come with their own bases.
Here's the thing. Nintendo obviously held back on a lot of things at e3, because their mission going in, along with alternate plans based on what Sony and MS were doing, was to show gameplay. Not bullshots, not pure CG reels, not conceptual stuff. Just gameplay. That is what they did. They showed us every game that they have that they were comfortable showing a lot of gameplay, and games that they were comfortable with being played on the showfloor. The only game that wasn't on the show floor was X.
There was no Yarn Yoshi, no SMTxFE, no talk of updates, no talk of hardware, no talk of gamepad, none of that. They said it was all about the games, and they told the truth 100%.
Well yeah, but we're just wondering if any games use the NFC feature.