I think the reason we don't hear much about them is that they're "old news", but I would expect at least an article on it in some science magazines, such as SciAm, etc.
And is interstellar space outside of the heliopause or the bow shock?
They send back information daily.
I remember reading that one of them lost contact. I'm pretty sure it was Voyager 1, but I'm not sure if a connection was reestablished or not.