Obviously, I can't predict when or if Apple will discontinue support for Snowy but my best guess is that it will happen as soon as Mavericks is released. Another wrinkle is that future updates to third-party apps may not work with Snowy. Ah, there's nothing like planned obsolescence...
And I, obviously, can't make any predictions either, but it looks like Mavericks's hardware requirements are the same as Mounty's, and that may suggest something about Snowy's immediate future.
You're of course correct about future app updates/grades, but personally, running Snowy has not (Yet!) left me unable to run a single app version I'd prefer, even care, to run.
Support for iOS upgrades is critical, though, and it remains to be seen how long that will remain even if Apple continues to release Snowy security updates.
