During this transition phase for most WACK groups you will see some odd things. Example: EMPiRE MV with the new members before they have officially joined. We are all aware that the new members join on May 1st, yet here they are in an MV.
Oh, by the way, this song is pretty damn good, as it the album. Also isfyou have not heard the other two songs with the new members you can still get them from OTOTOY.
Official Website: http://empire-official.com/
Get that album, it is pretty good.