Have anybody heard about any framework/product which provides Swing rendering for JSF ?
Technically, it could be done, I believe...just providing necessary JSF tags and render kit.
I've not heard of a framework that renders JSF from Swing, but there is at least one package that creates web apps from Swing applications. It is called WebOnSwing and can be found here: http://webonswing.sourceforge.net/xoops/.
There are also Swinglets at http://www.javelinsoft.com/swinglets/.
Or even SwingWeb: http://swingweb.sourceforge.net/swingweb/