The new icon for a branch "folder" in the source list is ugly and barely resembles a folder. It's a very pointy rectangle with a chunk out of it.

It's also kinda unnecessary, since each item that gets a folder icon has a disclosure triangle next to it, and indentation conveys hierarchy. To be honest, I preferred when each branch also had a branch icon next to it, but I can get used to those being gone. Having a folder icon but no branch icon is inconsistent and visually distracting. It causes the name of a branch to start further to the left than the text of the containing folder name. Please either use icons for both, or neither.