There are two iTunes releases of this EP, based on region.
On iTunes in the US and some other territories, Ed Banger released the five-track "On'n'On EP" on the 27th. You can find its tracklisting here. This one is the US iTunes EP - that's why it has five tracks.
Justice - On'n'On  [EP]
Original Release / WEB
MP3 / 320
Ed Banger Records / US iTunes EP / WEB
AAC / 256
Justice – On'n'On
Label: Ed Banger Records / Because Music
Genre: Electronic, Dance, Indie, Rock
1. On'n'On (4:30)
2. On'n'On (Ruined by Rick Rubin) (3:58)
3. Canon (Erol Alkan's Extended Rework) (6:49)
4. Canon (Tiga Remix) (5:53)
5. On'n'On (Video Village Remix) (3:29)
"Original release" adds the Brodinski remix