Downloadable as a pretty .pdf here**.
Or as a small picture:**
The order of things might change. When we need money depends partially on how fast we develop, on how much we speak, or the timing of key employees. We might decide it makes more sense to have a paid feature extension before we go open source.
In whatever order they get done, having these milestones helps us keep our focus on the right thing at the right time – which is the most important thing when your resources are limited.