The Bill has received Royal Assent, so it is now law. What is not clear is when it takes effect, though some people say the call centre agents informed them it will be from July 19, 2015. From what I read, certain parts of the bill could take effect sooner.
In all likelihood, your husband will fall under the new rules and thus have to wait longer to qualify. That is, 4 out of 6 years and in each of those 4 years the permanent resident must reside in Canada for at least 183 days.
On an entirely different note, I think the gov't made a mistake when they changed the residency rules for permanent residents. It used to be, you had to reside in Canada for at least 183 days each year to maintain your PR status(just like the US does for the green card). This meant people had to think twice about living abroad for long periods and in my opinion would have made residency fraud very difficult.
In my opinion, had they left it as is, they would not need to change the citizenship rules now(or to "strengthen" it as they say).
But with only needing 2 yrs in a 5 yr period, people can be abroad for 3 yrs and return in the last 2 yrs just to qualify and renew the PR card then off they go again. So instead of strengthening the PR's committment to Canada at the time of their citizenship application, they need to begin that process from when the person first becomes a PR. They have it backwards.