Are there any references in current WT literature about micro-evolution
Here is a quote from the August 2015 Awake, just a few months ago:
In that light, where does evolution stand?* Its operation cannot be observed. It cannot be reproduced. And it cannot make accurate predictions. Can evolution even be considered a scientific hypothesis? The same encyclopedia defines a hypothesis as “a more tentative observation of facts [than a theory],” yet lends itself “to deductions that can be experimentally tested.”
*By “evolution,” we mean “macroevolution”—apes turning into humans, for example. “Microevolution” refers to small changes within a species, perhaps through selective breeding.
So it seems that they accept "microevolution", acceding that even "selective breeding" is a form of evolution.