"Anniversary release" refers to a special version of a product or a significant update that is launched on the anniversary of its initial release or introduction. Full definition
Seems more appropriate for a 30th anniversary release than using fan art. (reddit.com)
To cap off an already stellar year, Accolade Wines recognised Ed's contribution to sparkling wines, releasing Australia's most exclusive sparkling wine, and a limited edition 1998 House of Arras 20th Anniversary release of the eponymous EJ Carr Late Disgorged. (accolade-wines.com)
We have seen many LucasArts game brought back through TellTale Games, and now Jane Jensen herself has returned to revamp Gabriel Knight: Sins of the Fathers for a 20th anniversary release in mid-2014. (geardiary.com)