Linux 3.12 [https://lkml.org/lkml/2013/11/3/160 was released on November 2, 2013]
Summary: This page is being written. Sorry for the delay
Other news sites that track the changes of this release: LWN [https://lwn.net/Articles/565715/ part 1], [https://lwn.net/Articles/566122/ part 2], [https://lwn.net/Articles/566546/ part 3]
1. Prominent features
2. Drivers and architectures
All the driver and architecture-specific changes can be found in the [http://kernelnewbies.org/Linux_3.12-DriversArch Linux_3.12-DriversArch page]
3. Core
4. Memory management
5. Block layer
6. File systems
7. Networking
8. Crypto
9. Virtualization
10. Security