As the guy above me said, but on top of that you'll also get the option to choose between Goblin and Gnome engineering. It's entirely up to you which one to choose, and it all depends on what kind of fun you want to have. I'm on a PvE server (regretting it now...) and everyone was telling me to go with Gnome engineering, which has different kinds of toys that you can play with. Can't really tell you much about that since I went Goblin engineering, which is mostly different kinds of explosives and other fun things. Come XPac I'm working hard to get the rocket launcher lol.