Last I heard Readium is (so far) strictly a Webkit/Chrome plug-in demonstrator.
After it is finalized then you *might* see its source code used as a reference for standalone epub3 reader apps.
But Readium itself is not going to be release outside browsers.
Do note that Readium is not intended for consumer use:
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Readium is an reference system and engine, not a commercial Reading System.
We do not plan to develop or host a full-featured commercial-quality application based on Readium. Others are welcome to do so, of course.
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Quote:
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The project’s primary focus is a reference system for rendering EPUB 3 publications. We also want to make it possible to embed Readium or components thereof in other applications that support the EPUB format. As a reference system, the user experience will optimize for use by developers testing EPUB 3 content, not for use by consumers.
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http://readium.org/readium-project-goals