Possibly new champion tease?

It's aatrox o kayle, they're swinging a sword and have wings

That's Omega Squad Teemo.

http://www.surrenderat20.net/2015/03/331-pbe-update.html#more

Edit: Well that's me, completely missing the point of the post. Derp.

Looks like a man holding a large sword

Look up "Helmet Bro".

Looks like Leona to me,the sheild and the sword foucas

Well, he's definitely a yordle...

Is it Tristana?

Looks like wukong to me.