What a nice idea to release four songs with a common theme as an EP! It'll be like a mini album, and I love albums that have a common theme (and style). I'd caution you not to expect something too punchy, though. I wouldn't be surprised if a song like "The Boy" would have echoes of "The Boxer".
As for the the "B-sides" label, I'm just glad we get to hear his new songs. True, some great bonus tracks have been left off albums in the past (how in the world can you NOT make "Follow the Ribbon" the closing track of Privateering?!). But as long as the album makes sense as it is and makes for a well-rounded listening experience, I don't care that much.
Also, don't worry about not getting access to some of the new songs. They'll all end up on the internet shortly. Everything does, for everyone and for free.