Funny, my Magic 8-Ball is cloudy as well when trying to ask about Mavericks.I guess nobody knows and unfortunately my crystal ball needs a motherboard replacement!![]()
I expect the window will be between 30 and 45 days.I doubt it. I suspect that once OS X 10.9 is launched in the autumn/fall anyone buying a Mac between the launch event and the actual release/availability date will get a free upgrade, but with the updates only being available through the Mac App Store that window will be small-to-non-existent.