It could be a good one, its a complete rewrite. The last one wasn't so good but the ones before it were good. I am patiently waiting for it, and will buy it if its good. It was originally due in august of last year, but as you can see it's fallen behind.
There is also the openGL bible 6th edition with a release date a few months later. It could also be good. http://www.amazon.com/gp/product/0321902947/ref=as_li_ss_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=0321902947&linkCode=as2&tag=gamer2creator-20
One thing to note is that the first book covers 4.3. Nvidia only has a beta driver with 4.3 support and amd has nothing yet. Both will support it eventually though. The second claims 4.0+. This maybe why the first book has been delayed.
In the mean time there are some very good tutorials for modern openGL 3.3+ on the net. Below are some of the best.