I will give a nutshell answer. My colleagues may want to elaborate on it as well.
Essentially, the Indian Act prior to 1988 provided for two things: an absolute surrender of reserve lands or a conditional surrender of reserve lands. As the language implies, an absolute surrender was to be used when a first nation, for one reason or another, wanted to have part of its reserve land cease to be a reserve. A conditional surrender allowed the first nation community to take that same step, but with some kind of a condition tied on the release of the lands—for example, a conditional surrender for railway purposes for however long railways might use the lands, or for electrical utility purposes for the length of time the electrical utility used the reserve.
Particularly with conditional surrenders to a particular user for a limited time, what happened was some first nations came forward and suggested that the specific use and the very particular purpose behind the conditional surrender meant that there was still some remaining interest for the first nation over time. They tried to tax the lands, but the courts decided that the nature of an absolute or a conditional surrender was such that the land was not clearly remaining part of the reserve in order to be subject to taxation.
The amendments introduced into the Indian Act in 1988 clarified two things. One, they made it very clear that there could be a lesser step by first nations, which was to designate lands but not to fully surrender them. The designation would leave a sufficient interest of the first nation in those lands, particularly to permit its taxation. That was the major benefit of the Kamloops amendment in 1988.
As I said in my opening remarks, what Bill C-45 is doing is targeting those designation provisions, for which we now have about 20 years of administration experience, to simplify the process and to make designations go through quickly. It's a surgical set of provisions. It doesn't change the absolute surrender provisions.