Have you tried another activity profile?
Fixed start-up issue when opening some map installations
Fixed activity based routing
Probably. The Mac and Windows releases seem to occur within a week or so of each other.
You won't get a specific release date from Garmin (or anyone here).
PS: I don't know if the Mac version has the same bug fixes as the Windows one. When I posted yesterday about trying 4.2.2 I mistakenly thought you were using Windows.