Derrick, who plays in the band, leaked the album himself. He sent it to people over the last few days and knew full-well that it would leak. While it 'sucks' that it happened, the leak was definitely more on the intentional side.
He explains his reasoning in this tumblr post: http://derrick-nathaniel.tumblr.com/...rds-piracy-etc
To sum it up for those who don't care to read it:
iíve been yelled at constantly for sending it people before itís release. i really donít give a shit about it being out. i donít see any money from topshelfís sale of the record. the money we make on the record comes from someone buying our copies at shows. we get a percentage of each pressing for free and sell those at shows. i donít think a record leaking is going to effect the sale of records at our shows. only a fucking dipshit is going to refuse to buy a vinyl record because they have the mp3s.