Yes, the WS12 is here: http://technet.microsoft.com/en-us/evalcenter/hh670538.aspx
Registration required. You can download the .ISO (localized in many languages) or .VHD to bind under Hyper-V
The VHD is an exe-archive (~3GB to download), ~8GB extracted.
The administration password will be set on the first start.
I’ve got it running having 3GB RAM.
Download and enjoy!