I don't know if there are any. That is Rick's talent and area of expertise. But based on faatal's recent posts alone about how valuable it is for them to be able to watch reactions of veterans and noobs alike during this weekend I would say that it is successful.
People keep wanting to fixate on the marketing to new players aspect of it which is, of course, a definite benefit and one we hope pans out and brings more sales. But it is just one aspect of the success.
Devs viewing others playing
Devs discussing and planning based on observations
Building hype
Having fun
Having that soft launch.
Frankly it has been good to see Gazz, faatal, Joel, Rick, Lathan, and all the QA crew participating and having fun the last couple of days and getting the validation that people are finding it fun. It will help once the inevitable complaints start coming in once thousands have it and not everyone is happy with the changes.
So it isn't simply a case of needing a certain threshold of new sales to justify the event. The event is justified thanks to other benefits that have nothing to do with direct sales.