About this redesign: I would welcome it with all my heart. For me, GitHub won on the social side. So let's put the social side in front. I find the current project and profile pages very poor and limited. I would welcome ghuser.io redesign as well.
If I really want to scan the code, I clone the repo and scan the code in my IDE. Or I use a browser extension that displays a folder tree in a toggleable-sidebar on the left.
The current "Files" is only useful to click on the files to get to see their contents. The last commit message for each file is something I look at when I'm bored and want to waste time. I also hate to see very old commit message on very old files like LICENSE.