Instant feeds are a playlist of bingable audio content.
All the episodes are available at once for the listener to consume, in order.
The first episode is dated with their Start Date, with later episodes going back in time from there to preserve the order.
All listeners see the same episodes, but they are dated with the listener's start date.
Any episodes added later will still have the listener's start date associated with them to play in the correct order.
If you'd like to release content on an ongoing basis, with future dates associated with the episodes, use a Date-Based feed. Instant feeds are useful for course content.