Are they waving? Dancing?

Are you ever at a convention and you feel awkward because you're not cosplaying like everyone else? It has a strange effect on you, doesn't it. Have you ever been attracted to girl you wouldn't usually be attracted to because she's cosplaying as Slave Girl Princess Leia? We're sure you have.

This is a nice change of pace. These two are cosplaying characters that aren't entirely known yet, namely Rytlock and Caithe from Guild Wars 2, probably for promotional purposes.

But what are they doing? The Robot?