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This is by Facebook's design and - the redirect issued by Wicket after the form post is simply discarded and the browser is never made aware of it. Access log looks like this:

"POST /appcontext/somepage?wicket:interface=:0:somepanel:someform::IFormSubmitListener:: HTTP/1.1" 200

Solution explained

Facebook provides a custom tag to accomplish a redirect within the Facebook canvas - Fb:redirect (http://wiki.developers.facebook.com/index.php/Fb:redirect).

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@Override
protected WebResponse newWebResponse(HttpServletResponse servletResponse)
{
    return new FBWebResponse(servletResponse);
}

You should be set!

A big thank you goes to jwcarman on ##wicket for helpful pointers.