In their article where they announced the new UI, the explicitly stated that they removed all caps from the panel headers as people didn't like it, and then in

In their article where they announced the new UI, the explicitly stated that they removed all caps from the panel headers as people didn't like it, and then in the line below immediately said they'd put the menu items in all caps. I actually read it twice and laughed out loud. No idea what they were thinking. Thankfully it looks like we can turn it off!