Hello Kwinten Volckaert,
There is no built-in ability to show the next news in version 3.0 of Sitefinity. Perhaps this functionality could be easily implemented with a user control. You will just need to take all news, sort them in the way you want and according to the current one show the next or the previous item. Actually, for the 3.1 release (including the beta) this functionality is already implemented. For the SingleNews control there are two more buttons: previous and next news.
the Telerik team