Cyanogen has released its latest update for the OnePlus One, Cyanogen OS (COS) 13.1. The update brings support for MODs (or Mods, or mods - there's really no consistency there), which were originally announced back in February. Note that this is not to be confused with CyanogenMod.
MODs are exactly what they sound like. They will allow you to modify different bits of the software. For example, you can add a Cortana MOD to the lockscreen, Hyperlapse to the Camera app, or Skype to the Phone app.
Adding a MOD can be accomplished through the settings.
For an example, here's what Microsoft said about the Cortana MOD:
With the updated Cortana mod, you can tell Cortana to “take a selfie,” giving you a voice-controlled, hands-free automatic countdown for capturing your picture. Once the selfie is snapped, you can quickly review the photo and easily share it right from the film strip on the phone. The Cortana mod has also been extended to the lock screen for easier access to all that you need from Cortana. You can search, set reminders, get to your schedule and more without ever unlocking your phone or opening an app.
Of course, there are more than just Microsoft MODs, and Cyanogen OS 13.1 will be available for more devices. Cyanogen promises to bring us into the "post-app era" with an open platform that can provide MODs for Camera, Email, lock screen, quick settings, and Phone.
The update is available for the OnePlus One right now, but it's rolling out in stages, as most Android updates tend to do. If you don't want to wait, you can always flash it yourself by heading over to the OnePlus forums to download the image to your device, booting into recovery, selecting Install from ZIP, and navigating to the file that you downloaded.