Nexus 5 running Android 4.4 KitKat, spotted.
Google is likely to release Android 4.4 KitKat sometime next month, along with the next smarpthone in the Nexus series, the Nexus 5.
Myce has just spotted a log file of what appears to be Android Key Lime Pie (also known Android 4.4 KitKat) running on the Nexus 5.
Images from Android 4.4 KLP / Kitkat with Babel Log
List of all the sensors in the Nexus 5 and evidence of Wireless charging of the device.
The log file of Android 4.4 Kitkat / KLP that's more than 10 MB in size and includes more than 133,000 lines that show some of the features packed in the software.
Added - Camera sensor settings
Added - Qualcomm RIL
Added - Display settings / DPI / Resolution
Added - Something that seems to refer to SD cards
Added - Free space and filesystems
(Click on or Tap on to enlarge the view)