While LLVM 3.4.1 was just released earlier this month as the first point release to LLVM 3.4, LLVM 3.4.2 is coming quick to fix some minor issues that cropped up into the release. With LLVM 3.4.2 is also build support for GCC 4.9.
The official LLVM 3.4.2 will likely come at the end of next week. More details on today's call for testing can be found via the LLVM mailing list. LLVM 3.5 with new features meanwhile is being planned for an August release.