When is Diana's price going to be reduced?

Is Camille out in NA Server? (I play on BR, but use this board for discussion)

And I never really understand how the price reduction works, all I know is when a champion is released, one or two will have their prices lowered.

I wanna say thanks, i've been playing a lot of diana lately and in the past 3 days i got her from level 5 to level 6 2 level 7 tokens, and this post reminded me to play her and get level 7 before she is reduced to 4800 IP just for the fun of it, my first game i went 20/0 and got my level 7 token lol.