This is only a part of the original skill tree
One of the most impressive things about the original game was its completely insanely huge skill tree that looked intimidating to even the most experienced roleplayer. The Awakening adds not only Act IV to the main game but also expands upon the already enormous skill tree.
If you have never played Path of Exile then you have missed out on a wonderful and entirely free experience that is almost as much fun to play alone as it is with friends. With the addition of Act IV and an even more impressive skill tree than ever, July 10th seems like a good day to give Path of Exile a try. Download it on Steam and let is know how you get on with that skill tree.