[Resolved] Copying https://lists.wikimedia.org/pipermail/wikitech-ambassadors/2015-November/001290.html here, because Tech/News links here.
The welcome notification shown to new users previously did not link anywhere, and just had some text which was not super useful. With the upcoming deployment of 1.27.0-wmf.7, administrators can put the page the notification should link to in the page "MediaWiki:notification-welcome-link" on your wiki. For example, on mediawiki.org, our welcome/intro page is , so I created  with the text "Special:MyLanguage/How to contribute".
This is customizable per-wiki because each wiki tends to have their welcome pages in different locations.
Original task description:
Right now the welcome notification does not have any link targets. Roan suggested that we could have an optional i18n message that would contain a page name of where the user should be sent.