I've been wondering that myself. First off, I would just like to say that I absolutely love this entire album. Hands down the best album OCR has ever put out in terms of quality, consistency, and tone. Everything just works for me personally.
That said, I was extremely surprised by disc 5. I normally have a bad tendency to skip past the bonus tracks, assuming that they were passed over for a specific reason. Which is why, when I listened to the whole thing, I was so flipping surprised. Each track on the bonus disc works absolutely brilliantly; Omen is a four-part opus that was friggin' cool, and every other track made me all warm and fuzzy inside.
Special mention needs to be made for The 6th Kingdom. I have always been a fan of Jovette Rivera's work, and hearing this track in the background when OCR originally reannounced the Kickstarter had me all kinds of pumped. This track stuffs all this awesome electronica and guitar and orchestra and so much other stuff that for all intents and purposes should not necessarily fit cohesively... and yet I cannot for the life of me stop rocking out to it. I really hope it makes it onto the website; people need to hear that mix.
I think later on I'll give a full album review, but we shall see.