Richard Henderson's AArch64 TCG patch is taking shape on qemu-devel:

https://lists.nongnu.org/archive/html/qemu-devel/2013-09/msg00347.html

All I need is something to boot on it!  Are we making images available
yet or do I need to trawl through the lengthy instructions here?

https://fedoraproject.org/wiki/Architectures/ARM/AArch64