[Ruby] IronRuby Running Unmodified Rails

I just saw this interesting twitter entry from John Lam:

I've also seen messages on the IronRuby mailing list like these:

We're just in a big time crunch before RailsConf so we're pretty well implementing anything that we need to in order to get Rails to run.

I'm not at the conference - anyone know if they managed to amaze anyone there?

Update: John just published more information regarding IronRuby and Rails on his blog. Check it out - the IronRuby project is groundbreaking in many ways.