Riot is currently sending emails out to players containing links to a new "DJ Sona" teaser pages!
Kinetic, Concussive, and Ethereal!
The email has three variants, each including a link to promo pages for one of the three DJ Sona tracks listed below. No details on who it is going out to or why. The Subject reads "here’s your VIP pass to DJ Sona’s launch!!"
Here's a look at those three song clips, each with their own page: