To quote this wikia's style guide:
A rule of thumb is to use present tense in all cases. For example, articles for quests, skills, activities, non-player characters, etc. should be written in present tense. An exception to this rule would be events that have occurred in the past, or for in-game content that has been removed. For example, holiday events that have already occurred should be written in past tense. For future updates and upcoming content that have been confirmed by Jagex, use the future tense.
- Past tense: Past events and in-game content that has been removed
- Future tense: Future updates and upcoming content that have been confirmed
- Present tense: All other cases