I have looked at the bill. I would be hazarding a guess, but if I recall correctly, as an interim measure, the bill basically provides for provincial legislation in that area to now apply on reserve pending the determination of laws by communities. I think the case is that some communities would probably prefer not to have the provincial laws apply and would rather have time to move to governing that area for themselves. They look at it as a governance issue.
On April 28th, 2010. See this statement in context.