HTC has released the Android 4.3 Kernel source code and related support files for the Google Play Edition of the HTC One. The kernel source code is from software version 3.06.1700.10 (up from 2.14.1700.15) and Linux kernel version 3.4.10 (unchanged from the 4.2 firmware).
You can download the kernel right here, and the framework files from here just before the full update starts rolling out.