No timeframe that I know of.
It is scheduled for calibre v3. Which will include a rewritten-from-scratch content server, including an in-browser viewer (I believe that will form the basis of the desktop viewer as well), and a client-server model that incorporates browser-based management and multi-user access.
And stuff.
...
It is currently being worked on, you can see the progress if you run calibre from source.
The new server can be tested (even in published releases) via the command-line: `calibre-debug --new-server`.
The content server and in-browser viewer are good enough to try out already, though not production-ready.
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