We like the way the death knight's talent trees are shaping up. Specifically, you can tank using 2moons gold good builds from any of the three trees. One may be slightly higher than another at any given moment in time, but overall the goal is that they are very similar and they are certainly more similar than the other three tanking classes. We can totally imagine a world in which Arms, Fury and Protection all can tank using different styles. The Prot tree would just be more about sword and board style than tanking per se. Perhaps an Arms warrior would tank with a two-hander more like a death knight does.