Red Hat developers for weeks already have been working to bootstrap ARMv8/AArch64 for Fedora. Right now this is being done from an ARM 64-bit emulator while in 2013 they should see the first ARMv8 hardware. ARMv8 packages are already being built for Fedora while right now it's only to the middle of stage two (of six) for bringing Fedora Linux to the new architecture.
This announcement was opened up today by Red Hat on the fedora-arm list. Extensive details about the Fedora ARMv8 status can be found from this new Fedora Project Wiki page.
Ubuntu 13.04 is also looking towards initial AArch64 support on the ARMv8 emulator. The Linux 3.7 kernel introduces AArch64 support, the GCC compiler now supports the new architecture, and support is coming to LLVM/Clang.