Though a few features, such as talent trees for the paladin and shaman classes, have yet to be implemented, Blizzard has clearly moved into the polishing phase of its World of Warcraft beta test. This is evident in some of the game's fundamental mechanics, such as the rest system. Though it was decried by testers when it was first introduced, the rest system has evolved in such a way that it no longer penalizes players who wish to play for extended periods. Rather, it merely rewards those who haven't played for a long time, just as it was intended. Blizzard has also implemented a few new features recently, including item durability and raid groups.