I'm using wordpress and I wrote an event post last year, and this year I foresee some traffic is going to come in.. for example my old post is about 'world cup 2013', and I plan to use all in one seo to change the title to world cup 2014 for this year, good idea or not? or create a new post and redirect the old one to the new one? Since google favor new post. I don't want to have duplicated content with 2 similar post, and I want to keep the old post's ranking in google. What should i do?