prerelease

Etymology

pre- + release

adj

1. Before release.
   They were aided by beta testers, ordinary people outside the company who were willing to try prerelease software and report bugs […] 2004, William Poundstone, How Would You Move Mount Fuji?
   In both years, only 10 to 12 percent had participated in formal prerelease programs designed to prepare prisoners for the transition from life in prison […] 2006, Mary Pattillo, David Weiman, Bruce Western, Imprisoning America: The Social Effects of Mass Incarceration

noun

1. A preliminary version of a work, released in advance.
2. (skiing) An inadvertent (premature) release of a skiboot from the bindings of a ski, caused by excessive vibration, such as going over an extremely bumpy piste.

verb

1. To release in advance