worlds decklists are published as part of the worlds decks that POP produce after the event. There are some scans somewhere on the Pokegym... if I find them I'll add the links to this post. that is assuming some other gymmer doesn't beat me too it.
You will be able to get ideas about what is being played at the current City Championships from their associated forums and the main Deck forum. But as there are actuall prizes associated with achieving a high ranking this year you wont find too many actual winners lists being published.