Wings is finally a reality in Elite: Dangerous, making co-op play a lot, lot better. You can join up with three other people and fly around in the Milky Way.
There are some nice UI indicators that let you know your wingman's shields, hull, and comms status. When linked up, you can automatically fly by their side with a push of a few buttons. All scanned data is shared among wingmen as well as bounties. You'll get other benefits being in a wing as well.
It used to be a lonely place to fly when I was in the beta, but now the Wings feature really makes playing with others simple in the vast world of Elite: Dangerous.