I have MonoTouch/MonoDevelop installed on my Mac, when I install Xamarin.iOS will the installer perform an in-place upgrade/replacement of MonoTouch/MonoDevelop or will I end up with both installed side-by-side?
I'm not sure if an existing MonoDevelop will be removed (mine did not but I don't always use the standard directories) so you might get both.
OTOH I'm sure that Xamarin.iOS 6.2 will replace any older MonoTouch release (since the directory names did not change) unless your existing MonoTouch is not installed in it's default location, i.e. /Developer/MonoTouch/
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