be news to (one)
To be something that one was not aware of or did not know. A: "Yeah, Jeff and Anthony have been going out for a few months now." B: "Well, that's news to me. I thought they were just friends." You aren't allowed to dump your grass clippings here? Well, that's news to me!
be news to
be information not previously known to (someone), and perhaps regarded as implausible. informal 2004 NZine – New Zealand Ezine This was the first we had heard about it, and indeed it was news to the local community and the Hurunui District Council.