By default, product formats with release dates in the future are not visible to users. TitleLeaf offers an admin setting entitled "Show Upcoming" to modify that behavior. Upcoming product formats are those with release dates within the next few months1. To allow users to see such product formats, change the setting value from "No" to "Yes".
Note: Both a product and it's formats have unique dates associated with them. A product has a field labeled "Date first published". A product format has a field labeled "Release Date". They are related. A product can have many formats that are "released" on different dates. A product's "Date first published" should equal the earliest of those format "release" dates.
1 The exact definition of Upcoming depends on the original setup of your TitleLeaf site. Contact support to adjust those settings.