Could the slight delay in release simply be due to legal issues such as scrubbing patent issues and verification that OSS code isn't infringing?
Update: +1 to everyone thinking 'man, I bitch about google sometimes, but this kind of thing is totally legit and awesome'
Google has generally been good about releasing emulator images prior to releases, though usually it's only a few weeks. Luckily, it takes time for Android versions to achieve large market share, so any bugs can be squashed before it's a big problem.
The definitive and fastest answer will always come from reading and understanding the source code, as I don't have to hope that someone had the same problem I'm having and someone else had an answer, or that someone will reply to my question before I give up. Eclair, Froyo and Gingerbread sources were enough for 99% of my needs though, but there was always this shadow of doubt for Honeycomb-specific features...
For the most part, having the latest source readily available will greatly reduce the amount of open browser tabs, and for that I'm thankful :)