Looking at the stuff we have seen that's led up to all of this - the DJ Sona files gradually added onto the PBE, this increase in musical and creative media by Riot with their Amumu video and the Frequencies video, and these teaser songs - I can't wait for this skin to come to Sona ^___^ the evidence does point to a very involved concept and collaboration, so I'm certainly throwing my vote in for this being the Ultimate Skin.
I still don't understand why people are so up in arms about this though. Saying its a bad idea, saying the ultimate skin should go to another champ, or that no one will buy it. First of all, sure - there are champs who haven't gotten any skin love for a while, but when you got over 120 champs, its going to happen unfortunately; everyone will get the love eventually! Second, saying its a bad idea before anyone has even seen anything is just downright ignorant and stupid. Might as well be toddlers throwing tantrums that they didn't get what they want >_< just saddening. And finally, where is the bar graph that says there are more people who won't buy this skin than there are people who will buy it? From where I'm standing, There seems to be a lot of people jumping for joy and saving their RP for when this skin comes out! So wherever this "majority" of nay-sayers are, I deeply believe that they are the minority compared to those of us who can't wait to see this!
And just so I can cover my bases, if perchance it turns out that DJ Sona turns out to be Legendary skin instead - I'm still going to buy it! And on that note and you all can look at this too - don't you think that the current Legendary skins could have been Ultimate skins if more work was put into them, and same for the Ultimate skins if the lack of work was put into them? That's just a thought to those nay-sayers who just won't stop complaining