I think I can answer that.
The updated numbers in the new tax bracket setting up the various thresholds are the numbers for 2016, and the previous numbers, reflected in the act, were for the 2009 taxation year and were automatically increased by another provision as a result of indexation. The figures that are reflected in the bill, then, are the ones for 2016 that would have been in place anyway, but with the introduction of a new $200,000 top threshold, the thinking was that it would be clearer to express all of the thresholds in terms of the 2016 numbers, so that there weren't some numbers for 2009 and some for 2016. They have all been brought up to their 2016 levels, which is where they would have been.