Seems to me that they're going to mandate that people are aware of what their payments could be if/when interest rates go up.
So instead of people blindly signing 5 year mortgages at 2.5% right now, already on the bleeding edge of their affordability, there will be some checks and balances in place to make sure that person is asked/checked if they can still afford that same house if mortgage rates were 3%, 4%, 5% etc etc.
It seems like a very wise move to me. A lot of people don't think beyond tomorrow, much less 20-25 years down the road when they're mortgages are still in place and interest rates are likely to be different.