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New tracking feature
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The company just announced a small roll out on their Facebook page.
The regions that are getting the tracker starting immediately:
The rest of the San Francisco Bay Area (we’ve confirmed it’s up and working in Oakland)
Parts of Arizona (they don’t specify which parts, but I’d guess its the major cities)
The Seattle area of Washington
Sightings seem like the old system. "Nearby" tells you a specific stop. I haven't tested it yet, but I assume the Pokémon is next to the stop. Unfortunately, even though I have about 8 stops in walking distance, it keeps on pointing to the same two stops, which are about a 10 min walk from me. The range for "nearby" Pokémon seems much larger than the range for "sightings".