When is volume 2?

http://promo.na.leagueoflegends.com/en/music-of-league/

Ive recently gotten very into all of League's amazing music.(Gotta Say Azir's theme is my favorite, Amumu's a very close 2nd.) So I wanted to ask- When is Volume 2? Some great songs from the year(Gnar's theme, Winter/Orianna's, Kalista's, Here Comes Vi, etc.) Will they make volume 2, or they simply not being added to a track?