The following map shows a WFS layer as in the example at http://openlayers.org/dev/examples/wfs-reprojection.html. When you want to define a unique values renderer for a WFS layer, you need to define 3 extra parameters: styleMap, uniqueValueProperty, and uniqueValueFillColor. This renderer is available in the mapping kit since version 6.x-1.5.

[map zoom="4" controls="default,statusbar,layerswitcher" baselayers="osm" layers="1" 1="wfs|http://sigma.openplans.org/geoserver/ows|States|topp:states|extract=true,styleMap={strokeColor:black,strokeWidth:2,strokeOpacity:0.5,fillOpacity:0.5},uniqueValueProperty=STATE_FIPS,uniqueValueFillColor={01:red,02:green,03:blue,04:brown,05:grey,06:yellow,07:magenta}" center="-103,41" /]

Note that only a few (Southern) states are rendered with this limited definition.