The newest VaultWiki release, as always, contains an impressive number of bug fixes. While we don't consider it a feature release, a relatively important feature has been added - UTF-8 support for URLs.
In VaultWiki 2.5.6, if you have UTF-8 support enabled in VaultWiki's settings and the board's language is configured with UTF-8 encoding, the foreign language characters in your article titles will now be included in the URLs. This will make many admins lives easier because you won't need to add entire character sets to their URL replacements anymore (unless you still want to).
This change doesn't render URL replacements obsolete. They are still useful if your board doesn't use UTF-8, and for defining custom phrases and other replacements for your URLs (e.g. '&' => 'and'). It's likely, however, that the ImpEx feature will start seeing less usage - which is ironic, since we have yet to complete it.