I found this blog post about Scrum on LinkedIn: When Scrum is too Much « Deep Scrum.
My thoughts on the sort of situation he is discussing isn’t so much that this is an example of “Scrum is too much” as much as it is that all the developers involved in this rapid-prototyping situation are senior enough that they already have or don’t need most of the advantages of Scrum: visibility, engaging all team members, protecting developers from frequent change, frequent iteration and working product.
To me this seems more like an example of an experienced team that was motivated to develop while the visionaries are still on their vision-quest. Post-Scrum, anyone?