I think the new cleaner UI has now some problems:
File status panel
1) information "nothing to commit", why? Better approach is to se blank staged files box a and blank unstaged file box.
2) Commit message - this is wrong. This is really big step backwards to Sourcetree usability. In previous version was commit more clear. I was able to see everything I want to commit at one place. Now I can see only changes is selected files. (It also automatically selects files which are not staged to commit - it is confusing)
3) Drag and Drop works only on icon, not on whole items (between staged an unstaged areas).