Siri activation sounds changed... today! Anyone else notice?

has anyone noticed that from one day to the next Siri's activation sound changed on Macos? I'm on Sequoia 15.2 on a M1 Pro with Apple Intelligence swtiched on. Nothing's changed in the last 48 hours (updates etc). The acivation sound used to be a more natural "um" or "uh huh". And now is a kind of "tone". Anyone else seeing this?