In amongst the leaks and rumors dealing with the OnePlus One, we've also been seeing a fair amount of confirmed specs coming direct from OnePlus. There has already been confirmation about how the handset would be running CyanogenMod, however we have yet to see much in terms of specifics here. Anyway, this latest bit is coming by way of a leak, however it does reveal a few pieces about the build -- including how it will be called CyanogenMod 11S.
What we are seeking comes by way of Engadget, citing a "reliable tipster." More to the point here, it seems CyanogenMod 11S is built on Kit Kat, which given the specs and details we've already seen confirmed for the One -- isn't all that surprising. In this case it will be Android 4.4.2. There wasn't anything mentioned in terms of the "S" though.
Still, speculation would suggest that has something to do with OnePlus. The screenshots you see here in the post show the lockscreen and the about screen. As you will see in the about screenshot, the OnePlus One appears like it will feature the standard three button setup.
Remaining specs that have been confirmed for the OnePlus One include a Snapdragon 801 processor with 3100 mAh (non-removable) battery, and 13MP rear-facing camera. Further details on the camera include how it will be a 6 piece Sony Exmor IMX214 with f/2.0 aperture. The OnePlus One will also have a 5.5-inch 1080p display and some customization options by way of the StyleSwap back covers.
OnePlus confirmed last week the official announcement would be coming on April 23rd.