This movie was supposed to come out ages ago - but there was some kind of studio dispute that delayed it. It looks like August 14 is the magical date. I'm not usually into sappy movies (The Notebook? Please!) but I will make an exception for this one.
If you haven't read the book, please do yourself a favor and read it right now. You won't be disappointed! (Unless you're unable to suspend disbelief, then you might have a problem.)