I've just become aware of the issue myself, but it seems, from what I've read, that the main catalyst for the change is a product coming out in Oct. called "The Book of Erotic Fantasy" from Varda Project, Inc.
The sad thing to me is that some D20 companies have already dropped that logo. I assume there will be an OpenGL logo soon. I'm also sad that soon WoTC won't have the cash cow of everyone needing their books as they do now. But then, I can understand distancing oneself from something that might give the gaming industry one more black eye, imagewise.
Thoughts? Anyone? Bueller?