Yes, the only two ridings affected are Kitchener Centre and Kitchener South. If it were a more significant change, if I were proposing to take more out of Kitchener South, one would wonder if you'd want to try to snatch some more of Cambridge on the other side. This is a sufficiently minor change that I think there ought not to be any concern about it.
On April 30th, 2013. See this statement in context.