US lawmakers have signaled that nothing created after 1928 will ever become public domain. Why 1928? That is the copyright date for Mickey Mouse and he is worth too much money to let become public domain.

If you doubt that congress has messed with copyright over the years here a is (7 page!)"cheat sheet" for when something will become public domain. http://copyright.cornell.edu/resources/docs/copyrightterm.pd...