Paul Michelman thinks this is interesting:

Chapter 17. Envisioning (Product Planning)

Before beginning the first customer-value-creation sprint, we need an initial product backlog. And to generate an initial product backlog we need a product vision. Many organizations also find it useful to create a preliminary product roadmap, which defines a potential series of incremental releases. Your organization might have other front-end artifacts that it prefers to create as well. I refer to the activity of creating these artifacts as envisioning, or product-level planning.

In this chapter I describe an envisioning approach that is well aligned with Scrum principles. It is also very useful for organizations that are trying to...