Not only the theme has changed, but the entire GUI (interface) framework has been updated. They changed a lot. The striped rows is now something the theme should implement instead of the framework. It's a bit more tricky because not everyone uses the same theme. I'm pretty sure I can get the striped rows back, but won't change the column headers to a darker colour as that would break consistency for other themes.
Edit: scrap this comment. Alternating rows is not possible anymore, even if I wanted too. The functionality has been removed by the GUI framework.