Priority review is for news editorial photos like events or recent updates about something, also when a buyer request an image on the message board as Py2000 has mentioned! If you made that by mistake it might be reviewed fast or not! If you do it on purpose to have a fast review you might get banned! Cheers!
If you have an image that meets all requirements for one of the (urgent) photo requests, you can contact DT support and request a priority review. This is more for helping the buyers to meet their tight project deadlines for images that they can't find in existing online database.
