The band Biffy Clyro released one of the more interesting albums of 2013, Opposites. Now they are set to release b-sides and outtakes and name it Similarities. They've put out a similar release before (Lonely Revolutions), and speaking to Kerrang the band had this to say:
"We still have four or five songs from the album that no-one's heard yet, so it'll be nice to put those out. We'll put something out called 'Similarities'. That will have 18 songs, I think."
The album cover isn't official and except the quote from Kerrang there's not much info right now.