But it wouldn't surprise me if they admitted that "micro" evolution exists. You can't deny it, but people who usually make a distinction between "micro" and "macro" evolution don't realize that they are the same thing. So called macro-evolution is basically micro-evolution over a longer period of time!
I wouldn't be so sure. Never underestimate the WTS's talent for intellectual gymnastics when it comes to explaining away scientific evidence. I remember the rediculous statements they made in the Creation Book regarding the Galapagos finches. They pulled the same trick that all fundamentalists do and said that these finches were merely "nothing more than another example of variety within a kind". They pull this stunt every time transitional fossils of other species are discovered. They glibly proclaim that no transitional fossils have ever been discovered; yet when such transitional species are unearthed, they conveniently say that it is just another "variation within a kind".