The World of Warcraft will be getting cosmetic accessories to spice up their characters. These items will allow people to customize the looks of their characters to greater reflect the classes and play-styles that they choose.
In the example that Blizzard gives, rogues could equip cosmetic daggers or vials of poisons -- they'd have no in-game effect other than to change the look of the character. And as we see from the picture above, librams and quivers (they're back from the dead) are also another example of cosmetic options. As with all new features, there's a lot of fine tuning, so don't read too much into everything yet.
This new feature was announced in an Artcraft blog post that briefly appeared on Blizzard's French site, but has since vanished. We suspect that we'll see another version of it appear soon.