On a trunked system, in the discription of the system there is one box that says LAST UPDATED, if you click on the underlined part it will show you what has been updated and on conventional systems the second line will show LAST UPDATED, also click on the underlined part to see what has been updated, also all updates in the last 7 days should be highlighted in the database.
As previously stated the new submissions will be highlighted based on how long ago the were entered by the DB administrator.
If you are not seeing a new submission it is probably because the DB administrator of that area hasn't had a chance to get to it yet. Sometimes they have to verify the info or wait for clarification from the submitter. If the info is in conflict with validated info or is already in the DB it will not be updated.