Google Now .apk?

I’m sure you guys know by now what Google Now is, if you don’t (and how could you not?!) hit up this link for more info. For those of us with non Nexus devices and can’t get to play with it, WE WANT THE APK!

Question is, is it an .apk or something baked deep into Jellybean that requires Jellybean to run it? If it’s an .apk please share!