Check out the patch notes for the v20 Lovely Update here: http://maplestory2.nexon.net/en/news/article/55909/lovely-update-v20
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Well, just for the record; striker is on the same picture as well. It's more than likely just some artwork they threw in there, like DanDK said. As much as I'd love to test out those three classes immediately, I think it's best they come out at a later date too. Hopefully not too much later, though. Theoretically, if official launch is in September, seeing rune blader (since I think the order was rune blader, soul binder, then striker) come out sometime between late October to late November would be nice; assuming that's how they did it in the Korean and Chinese servers.
Runeblader came out about 6 months after KMS2 released so if they stay true to the Korean release's we wont be getting runeblader for a little while after launch.