Okay, this is weird...

This new "refundable" fare is actually the *same price* as the current Y fare. The only difference is that you can't book it online. The MCS fare (which is substantially higher) is non-refundable and incurs a fee when changed or made into a credit, and the even higher F fare (but sometimes cheaper) is still non-refundable, but changeable and made into a credit without a fee.