Hello Jimmy,
There are still a few other issues that prevent regular Mac releases, but those are planning to be addressed "soon" as well.
For Windows, compilation was never an issue - but some of the changes introduced with 3.0 don't play nice with how Windows implements shared memory (specifically, the quirk that Windows auto-deletes shared memory objects that are not actively open in any process - something that regularly happens with Mist's 3.0 builds, causing breakage). A fix for that is also possible, but it might be a few more months before we get around to it at the current pace.
Since both Windows and Mac builds sort-of-but-not-really work, we stopped releasing them temporarily until those issues are resolved.
We're hoping to re-introduce Mac builds going forward from the next release. Windows is currently being aimed at for the release after that.
Normally we aim for approximately 1 release every 3 months, but the upcoming 3.2 release is running a little later than that already (because of some of the new code in this version working best when combined with other code that isn't fully ready yet).
Hope that gives you the information you were looking for!
Regards,
Jaron