Very nice and well done! Just one recommendation to make.. it would be a lot nicer to have one single icon style throughout the site/admin panel.. (perhaps something monochrome/minimal) what I see there are just some random styled icons.. especially on the image from "small icons".

Oh just remembered, I have this question on my mind all the time, yet I always forget to ask.. is there any raw estimation on the alpha/beta version release of D8?