What it looks like to me. That or some kind of Ultimate Kayle. Or.............................could it be................a new champ, someone else from Kayle/Morgana's dimension? On PBE it's actually listed as Warring Kingdoms Nidalee but it clearly isnt.
http://3.bp.blogspot.com/-6fB2zb0PHoU/VLbKHSsivoI/AAAAAAAAhko/L_NmRvjcJP4/s1600/Nidalee_Splash_7.jpg
Sivir is not Blond (look at the hair), but she's the only champ that wield that type of weapon so yeah, that might be Sivir.
In the background, that's 100% sure Nautilus.
The ultimate Skin is only for 1 champ, not two (unless the ultimate is for Quinn and Valor), so i think this two skins gonna close the Justificar Skins (Vel'koz, Syndra and Varus have one)
Dude, its obviously a legendary skin for Nidalee, In her Human form she turns herself into Sivir and in her animal form she turns into Nautilus
Given the gold and silver color scheme, I feel like this is a spoiler for the next championship or victorious skin. As for the blonde hair, they set that precedent with Shyvana.
Would make sense if they were Galactic skins since that seems to be the theme skin for Shurima now, yeah?
Although not sure how Naut fits into it.
It was released to PBE by mistake, If anything its a continuation of the battleborn kayle skin theme http://1.bp.blogspot.com/-3TDM7u1yUew/UEi2wr3OswI/AAAAAAAAHmU/asl6SzEUBrg/s1600/battleborn-kayle.jpg
It's battleborn Sivir and Nautilus
