Actually a new species arising = macroevolution.
It's more than the usual and customary macroevolution. It pretty much confirms the origin of a naturally occurring species; it breaks the chromosome discontinuity barrier; it demonstrates that new organisms can find a mate in existing populations. Three birds, one stone.
Wrong definition. When dealing with creationists, "microevolution" is the stuff that they have to admit has occured because it has been observed, and "macroevolution" is the "stuff that will never happen, ever" until it does happen, at which point that specific event -- and nothing else -- suddenly falls into the category of "microevolution" (with no apologies for claiming that it was impossible in the first place).