I think the blue line art is from the original Eidolon book, although it was black in the original, so it's been recoloured.
You could probably pick up second hand copies of Emer I & II if you looked, but it would now probably be cheaper to get the new versions, when they are finished. Especially as there will be more content. I suppose the only real reason to get them now would be for the sake of completeness.