i think you don't need to read the latest SEO books to understand SEO. try reading Aaron Wall's SEO Book and subscribe to SEO related blogs to read the latest trends in this domain.
I already gave them to you. Chris Beasley updated his SEO Guide this year (available in both HTML and PDF) and Dan Theis has one available that gets updated EVERY YEAR in PDF format as well. Please check my first post in the thread for the links.