Linux 3.8 has not been released . While penguins finish the redaction of this page, you can take a look at these articles:
LWN [https://lwn.net/Articles/528893/ Merge window part 1], [https://lwn.net/Articles/529313/ merge window part 2]
H-Online Kernel Log - Coming in 3.8 [http://www.h-online.com/open/features/Kernel-Log-Coming-in-3-8-Part-1-Filesystems-and-storage-1788524.html Part 1: Filesystems and storage]
Phoronix: [http://www.phoronix.com/scan.php?page=news_item&px=MTI2MDg The Feature Overview For The Linux 3.8 Kernel]
1. Prominent features in Linux 3.7
1.1.
2. Driver and architecture-specific changes
All the driver and architecture-specific changes can be found in the [http://kernelnewbies.org/Linux_3.8_DriverArch Linux_3.8_DriverArch page]
3. Various core changes
SYSV IPC: add sysctl to specify desired next object id [http://git.kernel.org/linus/03f595668017f1a1fb971c02fc37140bc6e7bb1c (commit)]
ipc: introduce message queue copy feature [http://git.kernel.org/linus/4a674f34ba04a002244edaf891b5da7fc1473ae8 (commit)]
4. Filesystems
- ext4
5. Block
6. Crypto
7. Security
Add "Seccomp" field at /proc/pid/status [http://git.kernel.org/linus/2f4b3bf6b2318cfaa177ec5a802f4d8d6afbd816 (commit)]
8. Perf
9. Networking
[http://www.linuxfoundation.org/collaborate/workgroups/networking/bridge bridge]: add root port blocking [http://git.kernel.org/linus/1007dd1aa50b0403df370834f647abef1722925c (commit)], expose bridge port parameters over netlink [http://git.kernel.org/linus/25c71c75ac87508528db053b818944f3650dd7a6 (commit)], add support of adding and deleting mdb entries over netlink [http://git.kernel.org/linus/cfd567543590f71ca0af397437e2554f9756d750 (commit)]
- Wireless
Allow to abort low priority scan requests [http://git.kernel.org/linus/cd2bb512cda58f1efb922ad6dc29013ea5d5d9d0 (commit)]
Allow to flush old scan results [http://git.kernel.org/linus/15d6030b4bec618742b8b9ccae9209c8f9e4a916 (commit)]
Allow drivers to support P2P GO powersave configuration [http://git.kernel.org/linus/339afbf4819e5c7c0a0422af43b8c2eccd059abf (commit)]
Support partial VHT radiotap information [http://git.kernel.org/linus/5164892184d1b9ce19e45e97e9ca405ea8b9ceb2 (commit)]
Support VHT association [http://git.kernel.org/linus/f2d9d270c15ae0139b54a7e7466d738327e97e03 (commit)]
Allow per interface TX power setting, instead of per device [http://git.kernel.org/linus/c8442118ad9cd05cfe3b993f058e70ab25b1009a (commit)]
IPv6 tunnel: add support of link creation via rtnl 'ip link .. type ip6tnl' [http://git.kernel.org/linus/0b112457229d8a17198a02f3cca32922d2e374f1 (commit)]
IPv6: add support of equal cost multipath (ECMP) [http://git.kernel.org/linus/51ebd3181572af8d5076808dab2682d800f6da5d (commit)]
IPIP tunnel: add GSO support [http://git.kernel.org/linus/c3b89fbba339aae533e380839fa078787635356e (commit)], add support of link creation via rtnl 'ip link .. type ipip' [http://git.kernel.org/linus/be42da0e1012bf67d8f6899b7d9162e35527da4b (commit)]
IPvs: Complete IPv6 fragment handling for IPVS [http://git.kernel.org/linus/2f74713d1436b7d2d0506ba1bc5f10915a73bbec (commit)]
B.A.T.M.A.N.: Add Distributed ARP Table, a DHT based mechanism that increases ARP reliability on sparse wireless mesh networks [http://git.kernel.org/linus/5c3a0e5535933349a5d6e6bc8b704e0611f21d3f (commit 1], [http://git.kernel.org/linus/0e861a3c4ffef56822e1d51c355e5020deaeaf5a 2], [http://git.kernel.org/linus/172244748204c894864def59133d0133ccfabe30 3], [http://git.kernel.org/linus/33af49ad8ae44de52c0ac30b1a9707dad5e4c418 4], [http://git.kernel.org/linus/c384ea3ec930ef11060a7308fbbd02b4871384f9 5], [http://git.kernel.org/linus/785ea1144182c341b8b85b0f8180291839d176a8 6], [http://git.kernel.org/linus/2f1dfbe185075a50dc8f0490a136377af53a1c62 7)]
10. Other news sites that track the changes of this release