Just read on twitter that Glimmer got out today.
Taken from the release announcement:
This is a video overview of the features.
The team behind it had extensibility in mind so it’s possible to create custom wizards yourself. There are samples available and another great thing: the source code’s going to be available on codeplex! According to the video it’s already there but when I did a quick search I didn’t get a result yet.
Update: perhaps the video was wrong as when I downloaded the bits I noticed that there was also a download link to the source on code.msdn.microsoft.com.
I just downloaded and installed it and gave it a test spin. It looks pretty good. I hope to give a more deep dive testing next weekend.