* single layer navigation: it looks busy, but it would improve my life a lot; I find the current one pretty annoying * showing statistics on the main page: this is very useful information for me when I come to evaluate whether I should use the library in my project
* list of commits: again it helps me to see whether the project is still maintained; if the last commit was 5 years ago the project might still be good, but possibly it doesn't work with the new versions of other libraries; also adding tags there is cool!
* icons added to "find/create/upload file" menu, really good idea!
* watching/not watching button
* language names right on the main page. It's very confusing to have to click on the colour bar to see what languages does the project use
And here are some things I'm not sure about:
* colours are more intensive and I feel that my eyes would get tired more easily; I like the current colour palette
* flattening of buttons looks very iOS-ish and I'm not fan of the trend
* there's no separation between columns, for a moment I thought that users avatars belonged to the files column and I didn't know why some files had user next to them and other didn't.
That's a nice experiment and I'd love to see more ideas like this, to understand the way of thinking behind certain design decisions.
On a side, I find it pretty sad that there's so much negativity in this thread. I know people are used to certain designs and don't like changes, but saying "I hate this" is very strong and I don't understand why anyone would have such strong feelings towards other person's blog post.