I watched a WWDC video and saw that there is a Refactor option in Xcode that -- boom -- can automatically update your whole code to use the new, more readable notation.
Rather than doing [NSArray arrayWithObjects @"a",@"b",@"c",nil]
, e.g. , you simply do @[@"a",@"b",@"c"]
Where's the menu item in Xcode that will convert en masse?
Select the target, Menu:Edit:Refactor:Convert to modern Objective-C Syntax.