As of 10am (PST) this morning we should have a new version of AFNetworking ready and waiting for us. 2.0 is a major change and includes a redesigned API and a completely new replacement for AFHTTPClient based around the new NSURLSession classes in iOS 7. There is a migration guide which is a good place to start (although it is slightly out of date at the moment, I am sure pull requests are welcome) but this looks like a fantastic v2 of my favourite open source Objective-C library.
I have been playing with the new interactive transitions recently and while the API is very good, sample code has been very hard to come by. This article by Colin Eberhardt takes a step by step look at what it takes to get one of these things running and is accompanied by a repository of sample transitions, both regular and interactive.
This is very likely not to directly affect you (you're really using direct isa access in an app?) but it's an interesting read and a peek under the surface of the 64 bit runtime. Notably, the 64bit iOS simulator does not include this change and I have seen a few other bug reports which are arm64 device only this week so just be cautious generally shipping 64 bit ARM code which hasn't been tested on a real device.