One thing they could add, if they wanted, would be how long the corrections take on their end. Then add on 18 months, and you know when it'll show up in software.
If you've submitted to Navteq MapReporter before, then you will have your own guesses. However, the priority seems to differ greatly depending on what type of correction it is. For example, they seem to take address and road corrections very seriously (as they should!), but I have some POI corrections in their database that seem to be going nowhere.
Some companies have a policy of openness and encourage employee participation in the user community. Other companies will reveal information only in a few forms that they control.