Apparently some idiot linked this (now deleted) video on the official forums (in a now deleted thread):

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ImageShack.usThis thumbnail is all that remains. :(
Why do I miss all the good things?
[LiveJournal]Bubbawheat: [Burnt Matchstick 50 tnk Pin] So, there was a thread about a video posted on YouTube with supposed animations from the unannounced staff melee powerset. It seems they were gotten using demoediting and the beta client...
[LiveJournal]Bubbawheat: [Burnt Matchstick 50 tnk Pin] ...and the thread discussing the video has been deleted.
[LiveJournal]Thea Anastasis: [Jill Palacios : 50 : stlkr inf] TRUST NO ONE
[LiveJournal]Thea Anastasis: [Jill Palacios : 50 : stlkr inf] orry. I'v had coffee
[LiveJournal]PatrickAT: [Confusionette 35 Cor Inf] I want Office Brawling. "Stapler!"
[LiveJournal]Noxilicious: It got deleted?
[LiveJournal]Noxilicious: Huh, maybe it's not fake, then
[LiveJournal]Bubbawheat: [Burnt Matchstick 50 tnk Pin] I saw the video before it was taken down. The animations looked very good, reminded me very much of Kilik and Seong Mi-Na from Soul Calibur.
[LiveJournal]SpaceNut: [Electrinox 50 Bla Inf] interesting...
[LiveJournal]Thea Anastasis: [Jill Palacios : 50 : stlkr inf] that'd be pretty cool
[LiveJournal]Bubbawheat: [Burnt Matchstick 50 tnk Pin] In fact, before people started saying things to make it seem much more like it was genuine. I though it wa a hack using Soul Calibur animations.
[LiveJournal]SpaceNut: I have wanted a staff set for a long time
[LiveJournal]Bubbawheat: [Burnt Matchstick 50 tnk Pin] poor Samuraiko thinks this leak might lead to them removing the /demorecord feature from the game.
[LiveJournal]PatrickAT: [Confusionette 35 Cor Inf] People were dumb to post it on the official forums.
[LiveJournal]Liz: I hope not, but I hope it means they are more careful of what they let it into live.
[LiveJournal]Liz: in the 'hidden code' or whatnot.