After lots of rumours, Google now rolls out Android 4.3 for all Nexus devices except Nexus One, of course. The Android name is still Jelly Bean so I guess Key Lim Pie must be Android 4.4 or later versions. The source code is also available at Android Open Source Project.
Back to the latest Jelly Bean, the update is released over the air in many regions. If you have a Nexus and your device says there is no update yet, please be patient.