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...there is indeed a preview of Qsys in the 10.0sp1 release! ... From a Nios II Command Shell you can just type "qsys-edit-preview" to load it.
I wonder if this preview is a good representation of how it will really look. I was a little surprised to see how similar the preview looks to the existing SOPC builder.
...control of the switching fabric. Does this includes more flexible arbitration methods?
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Hi Kevin -- The 10.0sp1 preview qsys is pretty rough, but indicative. The main difference is the fabric that gets built. When you start using the tool, though, the subtle differences will become apparent and make more sense. :)
As to arbitration methods and such -- caveat, I'm primarily on the authoring-tool side, and not directly involved in coding up round-robin fairness algorithms -- but yes. That's exactly the sort of thing we aim to, over time, provide.