During this period you may see some variation in the nearby Pokemon UI.
There are two types of trackers that are being tested Sightings and Nearby.
Tap on the Pokemon you want to track, and then hit the View button.
The screen will zoom in and show where the PokeStop is located in relation to your avatar.
Check the nearby list for other Pokemon.
Apparently, the real tracker is being tested with users in San Francisco.
There also have been some reports of people getting the most extensive update in other major cities as well.
source: www.techworm.net
