If you have a device running the 11S build of CyanogenMod, you’re in luck. Just like with the Gallery Next app, you can now download the Camera app directly from the Play Store to update it.
The only device officially with this firmware though, is the OnePlus One. So for now, it’s a very closed app. But if you have a OnePlus One or a device with this ROM, you can download the update now. For the rest of us, we’ll have to wait and see.