I really love the idea of cloud-fpga solutions, but I can't begin to fathom how this could work without doing the fpga "coding" in a high level language. The simulation speed of verilog is too painful...
That said, working with the GPU requires a very specialized set of high level constructions as well; I imagine that most workloads could have significant parts of their computational path abstracted out to pretty common easy to port fpga processes.
If you ever launch a beta...let me know!