The definition of eligibility for the program previously excluded those cities that were part of census metropolitan areas. The new definition essentially allows more cities to qualify, even if they are part of a broader census metropolitan area. The program, by design, is intended to focus on those communities that are vulnerable. Part of the targeting of this program is towards the communities that are particularly dependent on one industry or one employer. Even if they are in proximity to a larger census metropolitan area, they would now be eligible for the program, whereas previously they would have been excluded. That's essentially the eligibility change that was made through this measure.
On February 12th, 2009. See this statement in context.