The virtual service work as described in the recent GSIP [1] has been committed to trunk. I have also written some usage documentation [2] in the trunk user guide.
As discussed on the mailing list it was decided that this work was not suitable for the 2.0.x branch. However the customer who is sponsoring this work requires a 2.0.x release. So as described i have created a git repository [3] that contains a branch in which the virtual service work is available for 2.0.x.
-Justin
[1] http://geoserver.org/display/GEOS/GSIP+44+-+Virtual+services+with+workspaces
[2] http://docs.geoserver.org/trunk/en/user/services/virtual-services.html
[3] http://github.com/jdeolive/geoserver-2.0.x
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Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.