Facebook wants to show you more of what you have in common with potential new friends and make sure you don't forget about your old ones either.
The company is rolling out a feature that allows you to get a closer look at your friend's buddies. It's not only showcasing connections you've yet to make but a lot of current friends as well, which seems a bit odd, but I suppose it helps you orient yourself with friends you haven't interacted with in a bit.