My mortgage rate is changing! It was originally based on the London Inter-Bank (LIBOR) index, which has been shut down due to extensive manipulation and scandal, and my lender is about to tie my interest rate to a secret new index that they won't disclose. I tried to find out more but best I could find was "We're working with regulators and consumer advocacy organizations to move existing accounts from LIBOR to another index in a way that's fair and transparent." Not disclosing what index underpins my mortgage rate is opposite of transparent. They've had years to plan for this. I called an ARM specialist at my lender to ask and they said, "Derp, nobody's ever asked me that before, I dunno." The mortgage rate is the most important loan parameter next to the balance. I find it hard to believe that the lender's mortgage rate specialist doesn't know how the rate will be determined. NEVER TRUST BANKS :(