We are really happy to announce that we just updated the SWF (SWF19) and AMF3 specs with the latest information. I promised this to you guys a long time ago, this will give you the latest details if you are working with both formats. Some things were either missing inaccurate in both specs, so we fixed that. The AMF3 specification had some types missing like Vector and Dictionary that we introduced in Flash Player 10.
The SWF specification had some undocumented things like a new tag for Telemetry (Adobe Scout) and some other miscellaneous attributes that we now fully document.
You can find both specs at the following url: