At the beginning of a project the team will create a high-level release plan.  The team cannot possibly know everything up front so a detailed plan is not necessary.  The release plan should address:

• The number and duration of the sprints
• How many people or teams should be on this project
• The number of releases
• The value delivered in each release
• The ship date for the releases

Key inputs to release planning are:

• The prioritized Product Backlong
• The estimated velocity
• Any hard and fast to-market dates the Product Owner must satisfy