Ned Deily is in charge of the Mac build (as well as current release manager). Within the last week, he revised the official builds (now two, I believe) for 3.7.0b1, due in a day or so. One will be a future oriented 64-bit build. The PR and What's New have more.
He may not be reading this thread, but will read MacOS tracker issues with a specific proposal, data and a patch. Comparisons should be against the current master or an installed 3.7.0b1.