have you heard
Do you know (about someone or something)? Often suggestive of gossip. A: "Have you heard? Tim and Molly dated over the summer." B: "What? No way!" Have you heard that Ethan is going to transfer to a different school?
Have you heard?
and Did you hear?a question used to introduce a piece of news or gossip. Sally: Hi, Mary. Mary: Hi. Have you heard about Tom and Sue? Sally: No, what happened? Mary: I'll let one of them tell you. Sally: Oh, come on! Tell me! Bob: Hi, Tom. What's new? Tom: Did you hear that they're raising taxes again? Bob: That's not new.