Who are we building for, what are their needs (include example cases), why is this important?
How do we know if this is successful (i.e. metrics, customer feedback), what's out of scope, whats makes this ambitious?
What are our competitors doing, what are the technical constraints, what are customers asking for, what does the data tell us, are there external motivations (e.g. launch week, enterprise contract)?
What are the key user experience and technical design decisions / trade-offs?
How do we break this into discrete and valuable chunks for the folks shipping it? How do we ensure it's high quality and fast?