Bad news first: if you're a stateside player of Vindictus
, you don't know when you're going to be able to start playing with Arisha, as she's not releasing in Korea until August 7th. You can, however, take a look at her trailer just past the break to get a sense for the character and how she fights, so that's something, at least.
In play, Arisha looks to be a fast-moving character using a single blade and magic to teleport, freeze time, and otherwise tear through her opponents. Also, by the looks of it, she's got a pet dog. Take a gander at the trailer if you're interested in seeing more about the character, although you will have to wait for a while yet to play her yourself.