A special site for Eiko's M3 appearance has surfaced, featuring a preview of Yellow! (or to be precise, Yellow -1st chapter-) Go check it out here:
http://negativecamisolegirl.com/adir/Shimamiya4/ (click the "show detail" button)
I don't know if it's just me being an incurable Eiko stan, but I LOVE this preview. The melody and arrangement are bliss to my ears. However, I think my uneducated ears pick up some notable auto-tuning (do correct me if I'm spouting crap) and I think that might rub people the wrong way - personally, I don't mind it, since I think it goes well with the arrangement. In any case, I'm really excited about this single now. I was kinda fearing yellow would turn out to be a boring-ass ballad (something like Unison. I think that song scarred me a little) when news of the single first came out, but that fear's been thrown out the window. Can't wait to hear this song - and 2nd chapter - in full (assuming there will be some sort of more large-scale release, like with Onkalo, of course...)!