A new quest called Lux Adventure has been started on September 1st 2016 to get Via Lux Adventurer Medal. You should visit at least 300 unique portals to achieve it.
Also you can get a special medal called The Lux Odyssey Medal instead of Via Lux Adventurer Medal if you are in top 25% of those who exceed the 300 new unique portal visits.
The question is on how Niantic is going to sort the list?
Should I be in first 25% of all who hacked 300 unique portals or in 25% of all who get the most unique portal visit counts to get The Lux Odyssey Medal?