For those not keeping track of the new functionality of Linux 4.5 over its merge window the past two weeks, read this morning's The Many New Features & Improvements Of The Linux 4.5 Kernel.
Torvalds' 4.5-rc1 announcement was short and to the point. He encourages those able to begin testing out the Linux 4.5 kernel code.
The 4.5-rc1 codename is still "Blurry Fish Butt", which it's been now for the past few months.
Stay tuned for exciting Linux 4.5 kernel tests on Phoronix in the near future to complement our daily Ubuntu/Fedora tests at LinuxBenchmarking.com.