I've seen those blue outlined spots you are referring to show up on occasion. I chalked it up to whether or not the map was overwhelmed (for lack of other terms) with POIs/markers (like Commonlands, for example) that determined if they would show.
But like Landiin said, not all quests have that 'spoiler' info.
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"Certainty of death! Small chance of success! What are we waiting for?!"
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