Should you not already be well-versed on all of the Linux 3.14 changes, you don't read enough Phoronix. We have been writing about the Linux 3.14 kernel going back months and have dozens of articles and many benchmarks already from this latest bleeding edge Linux code. If you don't know about all of the new features/changes for Linux 3.14, check out our Linux 3.14 feature overview. There's a ton of good improvements found with this new release that will be found in upcoming distribution releases (but FYI, not in the upcoming Ubuntu 14.04 LTS release by default).
My favorite additions to the Linux 3.14 kernel would likely be the production-ready Intel Broadwell graphics support (also requires Mesa Git and other user-space components), many open-source AMD Radeon improvements, Xen PVH support, processor improvements, SCHED_DEADLINE was finally added to the mainline tree, there's new Btrfs and F2FS file-system features, and many other updates.
Linus issued the brief 3.14 release announcement a few moments ago on the LKML. He noted that there were several fairly late changes but overall the change-log is quite small from last week's 3.14-rc8. With Linux 3.14 being out, the merge window for Linux 3.15 is now open and obviously being kernel feature and performance junkies we're already looking forward to those improvements.
Days earlier many of the key Linux developers were celebrating 3.14 at the 2014 LF Collaboration Summit.