The start of it is there, but it needs work. You can text or voice chat with someone in the same instance, like at a station or in super cruise, but it doesn't carry over. Any many people either don't know how it works yet or are missing it/ignoring it when you hail them. If they can clean up the interface to make it a bit easier, and retain the connection, then it might increase in use. It's hard to use when everyone is darting around and drop in and out so much.
I am glad they are working on it. How do I access the interface? I didn't see an obvious way to start typing a message or voice-talking.
The trouble with comming in supercruise though is you can't tell who they are unless they reply as only the ship type shows up on the radar not who they are.
There is a key binding for it. "C" I think? I rebound it to a button on my joystick, lol.
It will make a little flyout window near the comms panel on the upper left of your HUD. From there you can see all of your friends, if they're online, plus any ships in your local space. However, you can only chat (text or voice) with ships in your local space, whether or not they are in your friends list.