A lot of stuff still applies and lot does not.
You cannot go much wrong for a penny, and if its not any good for you you can always give it to someone who still uses CS3.
Or pay a little more:
I agree with Ann.
Much of the info will be on general digital video editing, and will apply. Much will be on aspects of PrPro, that have not changed, so will still apply. However, when you find that the book refers to something that is no longer located where it says, or is perhaps called something else - time to hit the Help Files, as THAT has likely changed. Matter of fact, I think hitting the Help Files is a great thing to do anyway.