I've been using the Xcode 4 beta on and off for a few months and I don't think it's that much o a change. GCC was still the default compiler. The biggest change

I've been using the Xcode 4 beta on and off for a few months and I don't think it's that much o a change. GCC was still the default compiler. The biggest change was that instead of having to use interface builder it's all n there. So while it may differ from the current books, a few minutes of familiarization should have you back on track.