I ran a system update today and Gnome 3.16 turned up. Which was nice.
One thing that I always found mildly annoying in Gnome 3.14 (and I think that this was also true of Gnome 3.12) was that when I clicked the shutdown button it would give me a choice between shutting down or logging out. If I wanted to reboot, I had to log out first and then reboot from the login screen.
So, wondering if anything had been done about the shutdown options, I clicked on the shutdown button.
And my laptop shut itself down.
10/10 for simple behaviour. Minus about 30 for being totally unexpected.