LLVM developers were right on time for branching LLVM 3.8.0 and they are now preparing for the LLVM 3.8 release candidate. A LLVM 3.8 RC2 release is planned meanwhile for 27 January while the official release of LLVM 3.8.0 is expected around mid-February.
LLVM Clang 3.9 is the new version in development for release in about six months while Clang 3.8 stabilizes.
Stay tuned for more details on the LLVM/Clang 3.8 features and other changes along with more benchmarks as the February release nears. There also continues to be daily benchmarks of LLVM Clang trunk code via LinuxBenchmarking.com.