Yeah I was able to get my copy a day before it offically came out. On a quick glance it looks cool however I was sorry to see that there is a large list of fiends in it. I was hoping they would take a smaller number and treat them with more detail. However I have not yet had a chance read much of the book so I will withhold any kind of actual judgement on this volume.
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Oh one thing I forget to add to my prelim comments was in the introduction they made a huge deal about how this was the new definative source. They make a side comment about using whatever information you want in your own campaigns but that the new Fiendish codex is going to be refered to and used as such in future source material.