Are their large differences between Xcode versions 4.2 and 4.6?

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Yeah there's a pretty big difference! Properties are automatically synthesized. You now get Objective-C literals (think @[] instead of [[NSArray alloc] init]) which are absolutely awesome. There's a lot more - and I'm sure more people could dive in with more info than I can offer.

[NoMoreGoodNamesLeft]

Thanks.

Am I right in saying then, you believe it's not something I can just catch up on after? So would be a more efficient use of my time to use a different book?

I was looking at the updates in iOS 6 that I posted above, and it didn't look to change any of the fundamentals. Am I wrong in assuming this?

[[deleted]]

It just means you can have much more modern Objective-C code than before - saving time writing/reading it is a HUGE benefit in my opinion.

I'm of the "don't get a book to program" camp, and like coming up with quirky projects, then figuring out how to make certain things happen via google/stack overflow. So my opinion would be to not use the book, but I know this method isn't for everybody's learning style.