This is the unmastered version (aka rough/unpolished mix) of Underoath's Define The Great Line that was originally leaked back in March of 2006. According to the NFO:

This is an advance of Underoath's latest album "Define The Great Line"  which is due to hit stores all the way on June 20th. Keep in mind that a lot could change until then and this probably won't be the way it sounds when it's finished anyway. The volume was maximized for your convenience and any extra long silences at the beginning or end were removed. The last track also cuts off, but it's all that could be done with all that's available.