In its gestational stages, Patch 2.4 threatened to be a PvP landscape-changing patch with the controversial change to Life Tap and ill-advised buff to Flametongue. Those proposed changes won't make it live, however, and it looks like World of Warcraft PvP won't be drastically different than it was pre-patch. But there are several key changes that affect PvP, some classes more than others. Because there are no major significant changes to class mechanics or abilities, I don't expect the environment to change. But the best thing about PvP is that it's all about the little things, and Patch 2.4 brings a lot of little things into play.

Class changes
Most classes received changes that many felt were aimed towards balancing Arena play. Classes that were perceived to be over-represented in Arenas, such as Druids, received some nerfs while under-represented classes such as Shamans, received some buffs. Warlocks were initially thought to be on an upswing trend, prompting Blizzard to whip up the nerf bat. Fortunately, Blizzard noticed that the trend plateaued and eventually held off on the move. Despite the lack of radical changes, Patch 2.4 affects the PvP environment in a lot of ways, more for some classes than others.