net-fs/openafs-kernel and net-fs/openafs have a 1.6.5.1 upstream release. Tested and it compiles and runs fine (amd64). Includes support for newer kernels.
1.6.5.2 was released, contains quite important fix for tmpfs cache. Though it fails to build with 3.12 kernel the same way as previous versions. Patches are here: https://bugs.launchpad.net/ubuntu/+source/openafs/+bug/1246675 They're accepted upstream and will be in 1.6.6.
*** This bug has been marked as a duplicate of bug 500378 ***