True to their word (as well as RAWA's definition of the word "soon"), the End of Ages soundtrack is now available for purchase from Cyan through Amazon.com. More information about the soundtrack can be found on Cyan's Game Soundtracks page.
I will note here, though, that the 4 page Book of Marrim preview is also included in the soundtrack booklet, so you don't have to spend 45 euros on shipping to get the preview from the EU Collector's Edition anymore.