over the last half year I have implemented a processor and surrounding SoC bringing the RISC-V ISA (http://riscv.org) to the Papilio Pro. It implements the 32Bit integer subset (RV32IM).
The project is hosted on Gitub (https://github.com/bonfireprocessor). It still needs some additional documentation, cleanup and ready-to-run ISE projects to make it easy reproducable for others. But I post this link now, to find out if anybody is interested in my work. I will soon also post a bitstream here so anybody with access to a Papilio Pro can play with it.
I have also ported eLua to it http://www.eluaproject.net
@Jack: If you like I can also present the project in the GadgetFactory blog.