So, the 580 came out in Australia today. Here's some benchmarks for anyone interested.
Benchmarks
Metro 2033 (DX11)
Just Cause 2 (DX10)
Unigine: Heaven v2.0 (DX11)
Unigine: Heaven - Normalized Tessellation Performance
Core Temperature & Acoustics
The specs for the test setup can be found here
PCCG have the EVGA, Gainward, Gigabyte and Inno3D versions of the reference design. All are going for $699