You can do most of this with just WMS. It depends to some extent on your
tolerance for how long mouse is hovering before display.
First off, a hell of lot of geometry is not that big an issue to caching
WMS server (eg Geoserver). Only images are passed. Your choice.
Second, you have a couple of options for displaying features on hover or
click. If the geometry is very complex (over 100 nodes), then consider
using the SLDSelect Control
http://openlayers.org/dev/examples/SLDSelect.html with a hover handler.
This does it all with WMS. Otherwise, set up a GetFeature control.
eg
hoverFeatures = new OpenLayers.Control.GetFeature({
protocol: myWfsProtocol,
hover: true,
click:false,
maxFeatures:1
});
hoverFeatures.events.register("hoverfeature", this,
displayTheFeature);
hoverFeatures.events.register("outfeature", this,
unDisplayTheFeature);
the event handlers will draw the feature from the gml geometry
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