See the full ChangeLog in the source for a comprehensive list of all changes.
Download links for the latest release can be found on the download page.
WHAT'S CHANGED SINCE 2.5.8 Edit
The purpose of this release is to fix an embarrassing regression in the 'scorelog' function: if one continues from a saved game, any scorelog saved before that point gets wiped rather than appended to. (An unexpected consequence of our Git migration.)
There have also been a couple of minor fixes to the Catalan and Russian localizations.
See NEWS for older lists of changes.